Requesting I can paste a password from my PC to the login screen of the other computer, using Mimi Remote computer
You can't paste a password at the login screen of a Windows system as it's blocked by the Windows operating system itself. This is done as a security precaution and I don't believe it can be bypassed by Dameware.
Couldn't dameware intercept the CTRL+V and take the characters you have in the clipboard and just execute them quickly one at a time via the keyboard interface / driver?