As an IFATC controller, I have encountered some pilots who may have accidentally hit the wrong message, or just accidentally hit a button when they didn’t mean to send a message at all.
EDIT: Intended use, is for those (not so often) situations where a message is sent, but the aircraft’s movement does not reflect the message sent.
My idea is to add a “say again” message in the misc. messages panel. Perhaps this could be reserved for IFATC, to prevent spam in TS.
The subsequent response would either be (correction) disregard, or to resend.
(This is for those situations where the pilot does not realize they’ve sent the wrong message)