I cheat audio like crazy. I like to think of picture & sound as being like an married couple that has separate carrers, separate friends, watch separate TV shows, but still like nothing better than to snuggle up together at night to go to sleep. There's no reason why dialog from a close up couldn't be used for a medium shot if the lip synch can be made to work.
Here's a least favorite cheat- I
hate to dissolve on freeze frame or slow-mo. Nothing says "low budget industral" to me more than that.
Arnie
Now in post:
Peristroika, a film by Slava Tsukerman
http://www.arniepix.com/blog