I'd like a configurable option to allow audio output to both the headphone jack and the Go's built in speakers simultaneously.

The use case for this is probably small but I'd like to be able to use the headphone jack for a tactile transducer (Subpac) in conjunction with normal audio from the Go's built in audio (prefer not to use headphones / more comfortable / fewer cables).

For me this would be ideal for a game like Thumper or watching movies in any of the Go's media players.