With the “Xbox Extended Feature Support” option selected, you actually can map individual keys to paddles within steam. The problem is Steam Input/BigPicture has been incredibly unreliable for me within the past few months. I’m just glad I can make changes using the first-party software now.
Edit - saw your edit. Changed the post title to make it a little more clear
I admire your willingness to engage and respond to vague BS. Keep on keepin on, dude. (also get some rest)