Hmm you should be able to have more then 16 characters in your sig, but that inludes the bb codes too.
If you cant get more then 16 characters in your signature then i would suggest getting in touch with an admin (I suggest skulfuk or suomynona).
Well Slip look at my sig now... i only centered it and colored "JudoHunter" i know the color is BBc but does centering the words count as BBc Also? And i cant even add my shops to my sig because the url is too long it says