Push to talk user interface and audio

I use a samsung note 8 and headphones with a mic. When i watch someone screen sharing i cant use push to talk because my phone navigation buttons overlap the button to talk Wish there was a button to press while using other apps in phone to push to talk instead of having to swap back to discord app. I saw others voice their want for a system wide push to talk I want to be able to choose which volume control i.e. in call volume or media volume. to use while using headphones. I find it hard to hear a rythem bot and also just other people in channel and i can use another audio app and reach louder volumes. Thank you for taking the time to consider this. If any of these issues gets resolve i really hope its the push to talk.