Here's the thing.....
You can't control what users, especially new users, use for phrasing. Sure in a perfect world all titles would be accurate, clear, and well defined. But that's just never going to happen.
So, you are left with one option really -- edit every question if it doesn't fit some predetermined standard.
This causes a number of other issues.
New users traditionally aren't thrilled with having their posts edited. Sure on SE sites they eventually come to realize that the editing isn't a personal attack. But this is different than any forum or blog or anything else out there.
To combat any harsh feeling due to editing, those doing the edit need to provide some comment or feedback to the user so they are aware it wasn't a malicious edit.
Are the above 2 items even worth it for 2 or 3 words?
Edits need to be made. That's a lot of time that could be better spent by actually answering questions rather than focusing on specific working the questioner is using.
Edit cause question bumps. So if you edit a poor question just so the title doesn't have "can I" in it, you move it to the top of the primary page. But if the actual content of the question is poor, is that a good thing?
I don't see how repeatedly editing titles is beneficial in any way. We already edit very poor titles and your'e free to do that when you see them. If you want to take on some witch hunt for "can I", well, you're free to do that. But unfortunately, I won't be joining for the reasons I've outlined here.
I think it is FAR MORE IMPORTANT to be welcoming and assist new users than edit their titles for two or three words.