Am I missing something? If you want synchronised chants you just 'join in' in time, if it is quiet you start one, if you don't like a chant 'don't join in', don't know the words? make a new one up and see if other people join in.
The fans are not there as a service for those who 'paid to get some atmosphere', it is something you do to support the team and for enjoyment / amusement. There are too many quiet spells to be wingeing on about two chants happening at the same time. I have been going to the games since the very first pre-season game last year, most of the chants have been organic and have been sung and then others have joined in, went we (about 5 of us in aisle 21 row AA) started signing 'signing in the rain' two games ago did we plan it military precision and print song sheets and request others to join in and ask permission, NO! we just started bloody singing it because it was p!ss!ng down and we were losing! It's called being a fan.