I'm at back of South Stand near SW corner. Singing starts at the other side of the South Stand and a few of us join in fairly early to try and expand it into our side. Doesn't always work though. What would improve things...
No pensioner or kid discount season tickets in South Stand.
Be prepared to join in, even if you feel a fool - it's amazing how a handful of folks joining in can get others around them involved. I wonder if everybody is waiting for somebody else to join in. Sometimes we're too darned English.
Call out the moaners/abusers if safe to do so. I'm right near the back so I can shout out to those 4 or 5 rows in front of me - one guy kept calling Ince a lazy c-word last season - I shouted "give the lad some encouragement" and he shut up. I was only brave cos' he was quite a few rows in front so wouldn't know who had said this - for all he knew I could have been a hard-nut (instead of the shandy-drinking 10-stone southerner that I really am).
Plus, of course, the abusers are cowards aren't they? Tell BJ to his face that he can't pass? No chance. Shout it out from the safety of a crowd? Yeah, sure.