I was thinking it'd be pretty neat if we could access a files functions listing but in completions. I'm not sure how difficult this would be but at first pass I think this is something very feasible.
One possibility would be to check if the previous whole word matches exactly a file name but only after a period character to minimize polling. I understand some of the problems would include multiple files having the same names and I'm sure many others. But it wouldn't have to be perfect just enough to be useful. Thoughts on this?