It would be nice if within the Worksheet (code editor) there was the possibility to use Vi/Vim key bindings (DataGrip has a pretty nice implementation if you'd like to take a look).  I am aware it is possible to add Gvim/vim as an external tool however you lose code completion that way and it's nice to just be able to edit and then press F5 or F9 to execute.  Vim key bindings (for those who know them) are a great productivity booster.