[Request] Add configurable keymapping for using Smokestack charges

[ArkVeil]

It would be helpful to be able to rebind the smokestack boost button from space to a different keybinding. I run into an issue where I am forced to change Better Flight's keybindings to avoid using Smokestack charges when I want to use Better Flight's flaps. In this situation, I would prefer to change Aileron's keybindings instead.