I don't think sigs should be used automatically. If you want to put your name at the bottom of your post, I don't see a problem with that. However, all the other sayings are just a waste of space and only stand to interfere with the task at hand.
Jason
Yeah you are right =o(
Name and/or position instead would be the best solution. Preferably the first comment of yours in post the sig is like 'CrYpTiC_MauleR' then any later ones are an abbreviation your picked 'CM'