This Idea was originally from Draconic Evolution which is a forge thats stuck on 1.12.2 but I would love to have on fabric the tweak is when in creative mode and you fly around once you stop holding w a s or d you move a bit more from where you let go of the key this tweak makes it so all of your momentum is gone once you stop holding the key this would work the exact way flying does in freecam and would be great as a TweakNo addition!

I believe this is already somewhere on my todo list, at least it has been requested before as well. So yes it's planned to be added. I'll probably use a similar deceleration code to what the free camera mode uses atm.