I would really like to see some sort of api for creating clickable gui elements within sublime. I have switched to always using full screen without a menu or sidebar, but most of the users I support at my work are mouse driven and do not remember the key combinations very well (believe me, I have tried to show them the way of the keyboardā¦).
I think this would be a very big benefit for plugins like debuggers where the user could step through the code. We use a very uncommon language on my work which comes with a command line debugger (yuck!). I would like to be able to create a gui to interact with the debugger preferably through sublime. I am sure there are plenty of other use-cases that I am not thinking about,
I know this would take some significant changes to implement, but I think it would be a worth while investment of time. We have started to go down the path of adding icons to the status bar with the panel switcher that was added recently. Maybe that area could be the home for icons? Jon (and now with the addition of @wbond) has always done a great job finding the middle ground in my opinion so I am sure the sublime team will come up with a good solution if they decide to pursue this feature.