Support bind with also letting the key press go to the MSX

[MBilderbeek]

Suppose you want to trigger a script on a keypress that triggers something on the MSX (e.g. starting a game or starting the playing of a song in an MSX music player), so you can use it to record what was started. For that it would be very useful if the triggering key press would also be routed to the MSX.
AFAIK that's currently not possible with the bind command. What about adding an option to the bind command to also let the bound key get through to the MSX to support such scripts?