If you cheekily ask me for my one future #scummvm feature, it would be the ability to output multiple audio output drivers simultaneously.
I would really like to be able to play a single play through with both the Adlib and MIDI audio enabled at the same time.
There are other configurations I would like (such as being able to run mutliple MIDI outputs with different modes), but that one .. that one would really, really be a happy place for now. I would be super happy with General MIDI + Adlib, or MT-32 + Adlib (where games do both). That would open up a whole range of new possibilities.
Being the ability to support all the devices is excellent, but only outputting to one type of device ... we're so close to audio chaos.