In the vehicle forums I’m on it’s more common to list what you have [in your sig.] so you don’t have to write it every time you post. This way when you’re asking a question, for example, about if something will work with your motorcycle or not people don’t have to ask, “What year is it?” or “What model is it?” as that info is in the signature line. For me, I also have a link in my sig. that goes the the photo albums I have of how to do something.
I’ve used the sig. line to state what OS I’m running and the versions of Excel I’m programming in.
I guess I’m just one of those anal-retentive geeks that make better use of the sig. than most ::shrug::
I’m for having such data in a user’s card. Just allow admins to add such custom fields to the card. I was rather surprised that isn’t an option since there was no sig. option. <-- my two cents (these emoticons are extremely…odd…still not used to them).