They should be, but they aren't (yet).
Just one question: Where, in your opinion, would be the most obvious place to look on the wiki, provided that we made this information available?
Edit: Okay, after some digging through the Mafia source code
(relevant bit here), it turns out that those two are the only filters (in addition to the obvious, substring matching).
Double edit: Since the code uses regular expressions, you can even do funky things like "$<50 berry #>4" or whatever strikes your fancy.