So you want the dev to just make a completely different game?
This is a damn fetish game about cockvore. You dont see me going on footfinder and complaining about feet.
You do have some good points like the crouching part and rebinding keys but the others will turn this game into another one. The one about making the balls smaller is stupid as it acts as a limit to your ability to just take out everyone. You have to actually consider who you "kill" or you get blocked from going through doors and no longer being able to complete your mission. And the one about dropping bodies everywhere acts the same. You need to find a place to dump them. Maybe putting them in lockers would be fine but that again leads to changing a part of the game the devs havent intended for.
In all, you just want a different game that isn´t this one so go search somewhere else.