not gonna happen. if they want the game to end at a given time, or close to it, make it 60 minutes, no new inning, and 70 minutes, drop dead.
but asking me to blatantly and obviously unfairly (to one or both teams) break the rules of the game? won't happen on my field...
as far as getting way out at the bases, you'd better be doing that anyway
... but if you're gonna walk back slowly, you'd better have that same pace all game.