My personal interface dream is one where you can run the whole thing using keystrokes. I personally hate using the mouse, it's so much quicker just to do clackety-clackety-clack on the kboard.
Dunno if this is possible yet, since I can't run Construct till I get a better machine, but it'd be ossum if one could use the event sheet editor without NEEDING to touch the mouse.
So, maybe press left to highlight the conditions and right to highlight actions, up/down to go up and down through the conditions and actions, shift+up/down to skip straight to the next event, and so on.
Arrows and keys would be lovely, for those of us who despise the mouse.