Honestly I think the biggest problem is competitions being on tab. It just messes too many things up. I actually can't think of another editor that has both completions and snippets on tab. Most have snippets on tab and completions on ctrl + spacebar or some sort of intellisense. Actually would any sort of intellisense be possible? That would be amazing and it seems like some of what would be needed is already there, like when there are multiple snippets with the same trigger and the box that pops up and lets you choose.
Also +1 for some sort of way to unbind default keybinds from the user keybinds file. Every update I have to go and unbind all the quote and brace overwrite binds as they drive me nuts.