I'll look into why the regeneration players are asking or so much at your club - thanks for mentioning this as I haven't seen it indicated elsewhere (and its only the things I know about which I'll fix strangely enough

).
When a player is sent off you should be able to swap him around on the tactics screens to cover slots - I'll double check this now, but I'm almost certain if this was the case more people would be screaming about it (bear in mind there are a couple of tactics pages in the game not just the one on the PC).