I like it I guess, I don't think that trust would be able to set a warp, because as said above, it would make some ranks less worth it and in return, might not sell. In my opinion, trusted should be a very very small staff rank and get very basic commands. This being temporarily muting someone, kicking a player for bad language or things of that nature. They should not get any perks that come with donating though.
I wasn't thinking off this as another staff rank... People play 24 hours and are able to kick and mute people? The server would be a mess.