As to make the forums easier to read, and more search friendly to google, we've opted to keep the sigs limited, so as not to have massive amounts of repeated text down a thread. There are people that put full paragraphs in a sig, and when replying multiple times within a forum, makes it very difficult to read, as the sig can be longer then the post itself, and you'll see it repeated down the page many times, making the thread longer, load slower, and confusing to google about what is the true content and keywords on the page.
We'll be doing more about display personal info for each member, such as a hover over, so that if you roll over their username or avatar, you can see a more complete profile which would include more text, a larger photo, posting history, date joined, etc.
On Lefora, we're constantly balancing aesthetic and usability alongside a full feature set. Nothing on our product is locked down in stone, and we're constantly improving the site (and at times, changing our previous tenants). Sometimes we'll sacrifice options presented to admins in the admin panel, in order to make it easier to use and less overwhelming.