It would be really nice to be able to add a toolbar item associated with a command.
Like a compile/run button, code clean, etc.
I know there are shortcuts, but it's not as "user friendly" as a button.
The only real trouble here would probably be the icon on the item... but I guess that if you store command names you can store image as well.
Not really a priority for now to be honest (as shortcuts do the job correctly) but I will think about it.