Links in sig and the character limit

[Raduque]

Is it possible to make anything inside the link tag not count towards the character limit?

For example:

{L=Text}http://www.anandtech.com{/l}

Make the bold part (web addresses) not count towards the signature block character limit, but ONLY if it's preceeded by the {l=} and {/l}.

Is this something that's actually technically too hard or not feasible?

['s replaced by {'s to keep the forum from parsing them.