I have two "features" I'd love to see implemented in ST.
The first is one I really miss after coming from the old editor I used: when you're on an indented line and then jump to/create a new line, the spaces/tabs from the indented line (i.e. the previous line the caret was on) are stripped, if it was left empty (the actual line is kept of course). And hopefully this would be something that could be changed in the settings, in case there's people who maybe wouldn't want it?
The other one is pretty simple (hopefully to implement as well): when you're on the first line of a document and you navigate "up", the caret should go to the beginning of the line, and when you navigate "down" while on the last line, the caret should go to the end of the line. Most editors should support this by now really..