We've added a few things to the banned item list until we know more and can decided fairly how to deal with them:
RFTools Dimension Creators and such
Runic Dungeons Magic Chalk
They won't be banned forever, just for now. We'll have a solution for Runic Dungeons by tomorrow that will be fair for everyone to be able to enjoy it.
RFTools might take longer until we can understand how much they drain the server and how bad the crashes they cause are. We apologize for any inconvenience.