Move Frame by Frame?

Is there a way to lock in to only move frame by frame no matter how zoomed in to the timeline you are? I'm editing a film that was shot 24 fps and I'd like to have the option to move 1 frame at a time while editing instead of like 10 frames per actual frame of video? 

I'm crossfading between dialogue on separate tracks and I'd like to have a consistent method of editing. I want each crossfade that I execute this way to be consistent. Fade out of "Dialogue 1" over the duration of 3 frames while fading in "Dialogue 2" over that same duration of 3 seconds.

Should I just move over to ProTools?...