diff --git a/libdino/src/service/blocking_manager.vala b/libdino/src/service/blocking_manager.vala
index 183c8a9e..aa07f990 100644
--- a/libdino/src/service/blocking_manager.vala
+++ b/libdino/src/service/blocking_manager.vala
@@ -27,12 +27,12 @@ public class BlockingManager : StreamInteractionModule, Object {
 
     public void block(Account account, Jid jid) {
         XmppStream stream = stream_interactor.get_stream(account);
-        stream.get_module(Xmpp.Xep.BlockingCommand.Module.IDENTITY).block(stream, new ArrayList<string>.wrap(new string[] {jid.to_string()}));
+        stream.get_module(Xmpp.Xep.BlockingCommand.Module.IDENTITY).block(stream, { jid.to_string() });
     }
 
     public void unblock(Account account, Jid jid) {
         XmppStream stream = stream_interactor.get_stream(account);
-        stream.get_module(Xmpp.Xep.BlockingCommand.Module.IDENTITY).unblock(stream, new ArrayList<string>.wrap(new string[] {jid.to_string()}));
+        stream.get_module(Xmpp.Xep.BlockingCommand.Module.IDENTITY).unblock(stream, { jid.to_string() });
     }
 
     public bool is_supported(Account account) {
diff --git a/main/src/ui/application.vala b/main/src/ui/application.vala
index 780c37fd..bed6d01b 100644
--- a/main/src/ui/application.vala
+++ b/main/src/ui/application.vala
@@ -5,6 +5,12 @@ using Dino.Ui;
 using Xmpp;
 
 public class Dino.Ui.Application : Gtk.Application, Dino.Application {
+    private const string[] KEY_COMBINATION_QUIT = {"<Ctrl>Q", null};
+    private const string[] KEY_COMBINATION_ADD_CHAT = {"<Ctrl>T", null};
+    private const string[] KEY_COMBINATION_ADD_CONFERENCE = {"<Ctrl>G", null};
+    private const string[] KEY_COMBINATION_LOOP_CONVERSATIONS = {"<Ctrl>Tab", null};
+    private const string[] KEY_COMBINATION_LOOP_CONVERSATIONS_REV = {"<Ctrl><Shift>Tab", null};
+
     private MainWindow window;
     public MainWindowController controller;
 
@@ -116,7 +122,7 @@ public class Dino.Ui.Application : Gtk.Application, Dino.Application {
         SimpleAction quit_action = new SimpleAction("quit", null);
         quit_action.activate.connect(quit);
         add_action(quit_action);
-        set_accels_for_action("app.quit", new string[]{"<Ctrl>Q"});
+        set_accels_for_action("app.quit", KEY_COMBINATION_QUIT);
 
         SimpleAction open_conversation_action = new SimpleAction("open-conversation", VariantType.INT32);
         open_conversation_action.activate.connect((variant) => {
@@ -142,7 +148,7 @@ public class Dino.Ui.Application : Gtk.Application, Dino.Application {
             add_chat_dialog.present();
         });
         add_action(contacts_action);
-        set_accels_for_action("app.add_chat", new string[]{"<Ctrl>T"});
+        set_accels_for_action("app.add_chat", KEY_COMBINATION_ADD_CHAT);
 
         SimpleAction conference_action = new SimpleAction("add_conference", null);
         conference_action.activate.connect(() => {
@@ -151,7 +157,7 @@ public class Dino.Ui.Application : Gtk.Application, Dino.Application {
             add_conference_dialog.present();
         });
         add_action(conference_action);
-        set_accels_for_action("app.add_conference", new string[]{"<Ctrl>G"});
+        set_accels_for_action("app.add_conference", KEY_COMBINATION_ADD_CONFERENCE);
 
         SimpleAction accept_muc_invite_action = new SimpleAction("open-muc-join", VariantType.INT32);
         accept_muc_invite_action.activate.connect((variant) => {
@@ -175,12 +181,12 @@ public class Dino.Ui.Application : Gtk.Application, Dino.Application {
         SimpleAction loop_conversations_action = new SimpleAction("loop_conversations", null);
         loop_conversations_action.activate.connect(() => { window.loop_conversations(false); });
         add_action(loop_conversations_action);
-        set_accels_for_action("app.loop_conversations", new string[]{"<Ctrl>Tab"});
+        set_accels_for_action("app.loop_conversations", KEY_COMBINATION_LOOP_CONVERSATIONS);
 
         SimpleAction loop_conversations_bw_action = new SimpleAction("loop_conversations_bw", null);
         loop_conversations_bw_action.activate.connect(() => { window.loop_conversations(true); });
         add_action(loop_conversations_bw_action);
-        set_accels_for_action("app.loop_conversations_bw", new string[]{"<Ctrl><Shift>Tab"});
+        set_accels_for_action("app.loop_conversations_bw", KEY_COMBINATION_LOOP_CONVERSATIONS_REV);
 
         SimpleAction open_shortcuts_action = new SimpleAction("open_shortcuts", null);
         open_shortcuts_action.activate.connect((variant) => {
diff --git a/xmpp-vala/src/module/xep/0191_blocking_command.vala b/xmpp-vala/src/module/xep/0191_blocking_command.vala
index be312581..987f538a 100644
--- a/xmpp-vala/src/module/xep/0191_blocking_command.vala
+++ b/xmpp-vala/src/module/xep/0191_blocking_command.vala
@@ -15,8 +15,8 @@ public class Module : XmppStreamModule, Iq.Handler {
         return stream.get_flag(Flag.IDENTITY).blocklist.contains(jid);
     }
 
-    public bool block(XmppStream stream, Gee.List<string> jids) {
-        if (jids.size == 0) return false; // This would otherwise be a bad-request error.
+    public bool block(XmppStream stream, string[] jids) {
+        if (jids.length == 0) return false; // This would otherwise be a bad-request error.
 
         StanzaNode block_node = new StanzaNode.build("block", NS_URI).add_self_xmlns();
         fill_node_with_items(block_node, jids);
@@ -25,8 +25,8 @@ public class Module : XmppStreamModule, Iq.Handler {
         return true;
     }
 
-    public bool unblock(XmppStream stream, Gee.List<string> jids) {
-        if (jids.size == 0)  return false; // This would otherwise unblock all blocked JIDs.
+    public bool unblock(XmppStream stream, string[] jids) {
+        if (jids.length == 0)  return false; // This would otherwise unblock all blocked JIDs.
 
         StanzaNode unblock_node = new StanzaNode.build("unblock", NS_URI).add_self_xmlns();
         fill_node_with_items(unblock_node, jids);
@@ -112,7 +112,7 @@ public class Module : XmppStreamModule, Iq.Handler {
         return jids;
     }
 
-    private void fill_node_with_items(StanzaNode node, Gee.List<string> jids) {
+    private void fill_node_with_items(StanzaNode node, string[] jids) {
         foreach (string jid in jids) {
             StanzaNode item_node = new StanzaNode.build("item", NS_URI).add_self_xmlns();
             item_node.set_attribute("jid", jid, NS_URI);