Suppress input on long disconnects

When I leave mosh-client running disconnected for a while (like on an airplane), I worry that I will accidentally type some gibberish into the window, and hours later it will be sent to an IRC channel. I already talked to one person who independently shared this concern, so it's not 100% a case of me worrying too much.

Or I might send input deliberately, but before Mosh reconnects, I attach to the server-side screen from another client and switch windows. Now the input will go to the wrong program.

I think what I want is a Mosh escape sequence which clears queued input, and disables further input until it hears from the server again. But a fixed timeout would be OK too.