Re: Force a signature size
The problem is that restricting the signature size can only happen two ways: restrict the number of lines of text (which means a single image linked with BBCode only occupies one line, regardless of it's size) or restrict image size. This can be circumvented by having multiple images smaller than the 350px height stacked on top of each other, OR a single 350px image with a shitton of text beneath or above it.
It's not worth the effort to automatically restrict. It's just easier to deal with them as they're reported.