self revive kit

[therapy]

is posible change it? I mean we can activate the revive kit when we want!, for example in a few hard maps (like vacant, downtown and others) when you die in middle of gas (toxic and mixed waves) you need kill those zombies to save your team, you dont want be revived yet, but if you kill only one zombie you revived yourself and die instantly, and this is not good, no one want buy it to die again faster, and when is hitler or helga waves how we can be revived? no one revives, sometimes because is hard revive your team, and another is because everyone wants the bonus ( like me, lol), so I say activate the revive kit with a double melee or f, what do u think?