I just posted this on another thread, but I think it would work and is a GREAT idea...
I've suggested this before... I'd try to in some way do what Universal does for guests staying on-site - the alternate entrance. I realize Disney cannot do exactly what Universal does w/ the amount of resorts they have compared to the amount Universal has, but they could possibly break it up, like they do EMHs. It could be something like "on Mondays, Value resort guests can use those lanes in all 4 parks", then Tuesdays would be Moderate resort guests, Wednesdays Deluxe resorts guests, Thursdays DVC resort guests... something like that. Where all 4 parks are participating, and each category of resorts gets 2 days a week possibly. This could just be the fastpass lane. I don't think it would tie up the fast pass lanes too much, because it would be spread across the 4 parks, and only 1 category of resort guests are using it each day. So it's not like ALL the value guests will say "we have to go to MK today because it's our day there for the fastpass lane"... they could go to any park. The cm's are already there working the fastpass lane, checking fastpass times and dates. They'd simply have to check your room key too. What a GREAT perk for staying on-site. We LOVE Universal for this.