I would like to see arrangers have a separate audio in that ONLY goes to the internal speakers but not routed to final outs. That way, you can use the speakers as a monitor system, if you have a partner, or tracks, etc..

Many of them have external ins... but there's no way to stop it being fed to the outs. A switch that disconnects the ins from the outs, but still feeds it to the speakers would be cool.