I'm not sure the amount of people that would use this, but I think it would be great if there was an upgrade that you can buy for a Player Warp that would let you add sub warps to that player warp, which would not show up in /pwarps, but would show up when you go to the warp that the sub warps are based off of. I'm not sure what the limit of sub warps per upgrade should be though.

This world be very helpful for player that have very large warps but can't have a full warp for different parts of it.