It is a fair shout but fans wont move, like you mentioned when we have our fans in lower SS1 for some cup games it ends up a mixture of sit down none singers and a waste of time. The tickets are offered out for singers in every possible way, nobody is interested in doing it. If for a cup game that area got filled with SS3 fans and other fans that like to sing from all over the stadium then we could push the club to do this all the time. But it doesnt get any interest.
I know it sounds a bit negative, but there is nobody more brassed off about this than me, tried for many seasons but you just cant force fans to move.