[cryptonector]

I mean, the same is true on Unix. If an app is in the background and wants to write to (or read from) the terminal, it gets SIGTTOU (SIGTTIN) sent to it immediately. It might have to be impossible on Windows to ignore SIGTTOU/SIGTTIN/SIGTSTOP, but I think that's just fine.

Mind you, ptys + tmux/similar is certainly very good, and if that's all we'll get that's still way way better than the current state of affairs, but if that's all that will be possible it should at least be possible to pause the console's output (and flow-control the console application).