tmux: i, k, j, l for select-panes; faster repeat-time

.tmux.conf

@@ -1,10 +1,14 @@
 # Force colors for e.g. prompt
 set-option -g default-terminal "screen-256color"
 
-# Mirror prefix Left to prefix j for switching pane left
+# Mirror prefix+(Up|Down|Left|Right) to prefix prefix+(i|k|j|l) for switching panes
+bind-key -r i select-pane -U
+bind-key -r k select-pane -D
 bind-key -r j select-pane -L
-# Mirror prefix Right to prefix k for switching pane right
-bind-key -r k select-pane -R
+bind-key -r l select-pane -R
+
+# Faster repeat time
+set-option -g repeat-time 300
 
 # Exit parent process when detaching from tmux
 bind-key d detach-client -P