Suggestions

[Pascal123]

Whitelist, it may drive a few players away, but surely the sort of players that couldn't be bothered to make a whitelist application wouldnt be great buildersa anyway.

I wouldn't see why not, all we ever get is some new players who stay at spawn and leave or grief around spawn then leave anyways.

Creative. most of the problems people forsee with creative mode are caused by griefers, and the whitelist should have dealt with most of those. For those who slip the net, roll-back could be used surely.

This could be done, there is a rollback command that only rollbacks a specific players changes for a specified period of time, and it shouldn't be hard to find creative griefs.

World Edit for Doners. Obviously it would have to strictly monitered, with the removal of powers if nessacery, but if someone is serious enough to have got him/herself whitelisted and then spent $20, they should be pretty reliable

This is true but there would be no way to revert any worldedit changes i believe, the only defense we would have would be to keep a really watchful eye on any donators which would be difficult.