WE just need to be nudged from time-to-time. We are just now putting a solution for this on the test server and will report back ASAP as to when we might be able to release for all members.

There are a few things we are still toying with:
- disabling signatures in PMs
- returning "request a read receipt for this message"

Anyway, appreciate the question and hope to have a solution for you real soon.