"but it would be a way of stopping idiots^W non-technically minded Windows users accidentally cut-and-pasting sensitive data directly to their social media applications"
You were better with "idiots" - this (technically minded) anonymous pleb once typed his password into IRC, with SSH open on the IP I was connected to IRC with, and an IRC username very similar (4 chars) to the SSH username that the password went with.
I've never changed a password so quick in all my life. I blame touch typing and not paying attention to which window the input was going to... idiot either way :)