Quoted By:
As a Dm, i just allow everything. If someone tries something broken, i generally allow it, unless its pun pun or some infinite combo shit.
The fact of the matter is that as a dm, you have to keep the power curve intact, and if you do so by limiting the players, youre a lazy dm. Instead, do so by powering up what they fight.
You have acess to all the same splatbooks they do, plus templates. You can give anything class levels, and theres no reason your shit shouldnt be on the same teir as theirs.