I can point you to a piece I'm working on presently that deals with some of the issues you mention:
Mr. Harold Grizzle Oral History Project
K-x, Panny P&S, Sony TCR, Tascam DR-1, & Audio Technica DD wireless.
This piece has NOT been color timed.
The audio track and cuts have NOT been synchronized.
The titles are just place holders presently.
It's a SKETCH, after all.
iMovie is a toy. (though, capable of doing some great things in the right hands)
If you plan to do more sophisticated production, look into Premier Pro (Adobe product), or Final Cut (Apple product.)
There are others available too-- but those two are the leaders (in my book.)
Synch differences for matching audio is due, in large part, to inconsistencies of the recording devices. (hard to imagine what with everything being zeros and ones, but intervalometer correction is possible with a few 'tricks'.)
As a matter of fact- this piece of video has a 'trick' or two already in place (corrections for the differences in FOV/aspect ratios.) See if you can pick them out.
There's a pretty cool clapboard available for the iPhone/iTouch.
I use it a lot--- it's called Llama Slate. I think it's $9.95.
Very handy to have in your pocket (if you've got the iPhone/iTouch.)
That'll help you keep the cuts in the same ball park at least.
AND- speaking of 'ball parks'--- is that the "green wall" behind you in the avatar??
Cool!