Feature Request: search via URI, applescript or both

Suppose I have many clients, one of which John at john@johnemail.com. I manage past communications with these people in my home made CRM but use MailMate for email. When I have John's profile on CRM open and want to look into the past communication history, I need to have a way to look up all emails between me and John on MailMate. But right now there is no good way to do this other than copying the email address, pasting it in the search window on MailMate and hit return. I would like to see an easy way to do this via mailto: URI. Might it be done by mailto:john@johnemail.com?search or better yet mailto:search="a john@johnemail.com" or something similar enabling use of search modifiers that work in the toolbar search.

If the same can be done via applescript that would be great, too, but 99% of what I want to do can be done via a simple interface outlined above.