discord streaming with a specified audio input(s)

this is kind of an odd request but i was wondering if you could add support for streaming one thing, (like the desktop) and getting audio from a specific application (or maybe multiple if thats possilbe). 

I like to stream fl studio to one of my friends, but i guess because of the way that fl studio is built, it glitches out and zooms in on specific sections or just gives a black screen some of the time. the only way to get around this is if i stream my desktop, but then there is no audio. It would be nice to be able to stream the desktop, but then specify what program i want the audio to be taken from. Im not sure if this is possible, and im sure its not really an easy thing to do. but it would be nice to see a feature like this in the future. 

another cool thing would be getting audio from multiple programs, like for example. your playing uno and listening to music when a friend asks to watch, then you could stream the game, and also specify that you want audio to be collected from the program your using for music aswell. then you and your friend can jam out while you get destroyed in uno

if you want to complicated things a bit, then the veiwer could control seperate volume sliders for each audio input. I dont think something like that would be nessasary, but if your streaming to like 5 people, and one of them doesnt like your taste in music, then they can mute the music and listen to their own songs, but still hear the game audio.

the main thing is just multiple audio sources for one video source that would be cool i think thank you bye