Help with limiting formulary options

Hi,

I'm toying with an idea about limiting the options in the editor so that including a formulary can only be done once (and with predefined values) and the fields in it can only have a name selected from a certain set. I'm guessing it shouldn't be to difficult but in order to avoid having to look around the whole code I was hoping for some pointers to the right direction.

Thanks for your help,

Alejandro Castillo