Your request is pretty popular and already known by our developers. However, right now it's impossible to change the control buttons. Your request is pretty popular and it is already known by our developers who are considering the addition of customized controls to Mech Arena on Plarium Play. If you want to customize mouse/gamepad sensitivity, crosshair, damage display, targeting assist system, or HUD layout - press on your icon (the left top corner of the screen) and find out the Controls button (the last one). Press on it and you will find out all the control settings.