The area beside the scrollbars which activate the "resize editor pane" functionality is too small (less than 5px wide). I resize multiple panes regularly while working, so I always run into the difficulty of performing this action. I like how this area is big in Vim making it extremely easy to do this.
I also love Sublime's zoomed-out map of the opened file. Why couldn't the vertical scrollbar just disappear (leaving it's whole 20px width for easy resizing) and just use the Sublime file navigator as the only vertical scrolling control?
Customer support service by UserEcho