Yes... you'll want to add an external push button. When the LCD receiver first came out there wasn't a whole lot of need for one, but now that other functions are being added it's becoming a necessity. Most people add one anyway... if I can find one I like I may include that and ditch the little tactile switch.
The Black Aero case included one and if one flies a TRS they likely already put the momentary switch in their LCD. Kurt