I like the idea but there is something i'd like to add if it is possible.
It would be great if all the options like [B] , I , U , S
and other things which help in creating a good signature are there.
Just like when we reply we see them , There should be an " Edit " button over the signature sign , from where this big window appear in which we can customize our Signature , real nice.
Anyway Upvoted.