I'd say it's a good idea. I wouldn't mind being able to have all offense troops go to the bunker as they build or return. Only downside is that you don't get to catch people's offense out, but since the combat point rework you don't get good points for attacking offense anyways.
it has already been done in reborn. lol I have 12 auto-bunker @ 8 hours didn't cost me any crystals. but then again they like to stick it to ya on browser version. winters brother is awesome.