After many months of hard work, sweat, blood and tears, I believe I have finally found the (Exceedingly obvious) roots behind all this game's input rebinding related issues.
And so, all the previous issues relating to key rebinds should no longer be there.
On top of this I've also done several smaller things.
[list]
[*] The screenshake slider no longer resets upon each level loaded
[*] Powerups should spawn more often now
[*] Shocker punching The Entity no longer sometimes leads to a locked fist
[*] Mechavore's weak point is a little more obvious now
[*] Nerfed the shocker punch distance upgrade
[*] Removed Herobrine
[*] Did some other smaller fixes
[/list]