you are one of to visit this site.
First up, to stop players running rings around you, decide exactly which books you are using and read them thoroughly. This will help stop players using books to their advantage. Use of the transdimensional T.M.N.T. book should be limited to games where time travel or interdiminsional travel are planned, else all hell will break loose. In a similar vein use of the "guide to the universe" should be limited to games where space travel is the basis. In the T.M.N.T. Adventures supplement there is an area on using superpowered mutant animals in the games, this can damage game balance so be careful on dishing it out. Failure to follow these steps can result in your campaign being ruined by the superpowered mutant T-Rex Scientist/Observer with the ability to return to his natural form and use temporal magic and his Ka Trib built time machine/dimension hopper. This CAN be done!!! Be afraid, be very afraid. Also, be careful, be very careful.