Add ?Subject=...

When I put an traditional e-mail-link on a site or in an e-mail (one that opens the e-mail program) I can put an "?Subject=xxx" to automatically create the subject. In the contact forms I can create a link with a href="contact/me?Subject=xxxx". But the part after the "?" doesn't do anything (yet).
Would it be possible to add as feature to fill the subject line, like now the name of the sender (when known from the user-id)?

Thanks for this very usefull module.