Tony, how about developing something around Crown Point, already a bit of riding there (couple of bridleways), link already in to Cragg (MTL), people already riding there, close to both Burnley and Rossendale. Maybe another Billinge Wood style development, not as technical as Lee Quarry, maybe a place where less experienced riders could go but still get that moorland riding feel.
As for an indoor pump track, how about in the offices in Futures Park, not exactly over flowing with the Hi-Tech industries it was built for!
LQ is a playpark rather than a full-on trail centre, it's for skill sessions and a quick hour or two
If you (unofficially) link the two quarries together you can already lose 3-4 hours, with more quarries in the mix it'll be possible to lose a day there.