Can't we just put it under the profile button (user description)?
I really hate signatures, mainly because google shows it in search results
I really like that we don't use avatars
If not

- smaller font is a must. It is really disturbing to have signature font same height as post font. I thing 1/2 height of post font will be ok! You can always increase font size in your browser if you have problem with small text (I have

). And with the smaller font 4 lines of text is too much. I'm posting on forums which have 2 lines sig restriction and it is working quite good. It is even better than font size description. If you want simply add simple sig like:
cheers
VERiON
2 lines of text (even normal size) just fit, but if you want describe your 5 computers

- you have to use small text to fit in 2 lines.
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Another idea - An option in "profile" section allowing you to switch off sig (not only your sig - all sigs).