add extra config

config/programs/tmux.nix

@@ -19,5 +19,18 @@
         '';
       }
     ];
+    extraConfig = ''
+      set-window-option -g automatic-rename on
+      set-option -g set-titles on
+      bind -n M-Left select-pane -L
+      bind -n M-Right select-pane -R
+      bind -n M-Up select-pane -U
+      bind -n M-Down select-pane -D
+      bind -n S-Left previous-window
+      bind -n S-Right next-window
+      set -sg escape-time 0
+      set -g mouse on
+      set -g default-terminal "screen-256color"
+    '';
   };
 }