Removing quote formatting from signatures

I have an unabashed hatred of giant sigs, so on my forums I added two small bits to the template to right align, and kick down the font size. It works great, but for one small detail.

If someone quotes another person in their signature, it extends the quote box the entire length of the screen. Is there a way to remove the special quote formatting, or perhaps put in a replacement variable for [ quote ] [ /quote ] so that it does something else in the signature bits?

Cheers!