Limit per permissionSuggestion
Is it possible to do something like NTeleportation did? Where an admin can set diffrent permissions with diffrent amounts per level..

"tl.default" : 5
"tl.VIP" : 10
"tl.VIP+" : 20
"tl.admin" : 50 - This would only be needed if admins not set to ignore limits.
I'm not sure this would work very well, because the limits are per building rather than per player. I could technically check the TC access list and grant limits based on the maximum "level" user on the TC, but that gets a bit complicated. I don't think I'm going to implement this just now, but I'll have more of a think about whether there's a cleaner way to do it.
In response to gsuberland ():
I'm not sure this would work very well, because the limits are per building rather than per player....
If you do implement it, I can see it being used. Personally I'd use it for my server.