Running multi-promote has worked fairly well with my premade, although admittedly we haven't played as 5 in a while.
Strat would be to come by and promote a minion with a quick gank, and it would rotate. Bot would typically almost always be decapped, and if it wasn't then there were multiple people fighting just to keep the point alive down there.
Especially if you take Garrison. If you go Garrison/Promote, and use them both as you are about to siege a tower, then that tower is going down and there isn't much that anybody can do about it. Works really well at bot lane, especially if you have someone elusive that can escape ganks pretty well, as they will inevitably come very frequently.