Disabling stuff for SMP?

[Livebait]

I apologize if this is already discussed somewhere but I have been looking around trying to figure out how to disable Mass fabricators, or most uu matter recipies on an SMP server I am trying to host for me and some friends. I checked through the configs and could not seem to find it. I also am attempting to disable Mystcraft/Dimension doors I figured easiest way to do this was just set all the item id's to 0 in their config files if someone has a better idea that would be much appreciated. I am just trying to create a fairly stable server and figured those are some things known to create some enormous problems from what I have heard but am not sure how to disable. Any help would be greatly appreciated.