Skype link at email signature

Hi,
I want put my Skype contact like (skype:j.francisco.o.rocha?add"?) in email signature but i can't because signature only suport http: and email: links.
Possible solutions:
- Enable html editor for signature (workaround) because at this time that is not enable
- Add support for Sype links (skype:)

Any help for this?
Thanks
Francisco Rocha