No there isn't a roll "button".
Aces High models realistic fly as closely as possible given the technolegy available.
To roll you need to have a joystick.
With 1 or 2 exceptions, to enjoy AH and have a chance at winning you must have a joystick.
Personally I recomend the MS Sidewinder Prec 2.
Its USB, good all in one stick for 50$.
If you do have a joystick and are just having trouble email me at
billj69@btinet.netI'll be glad to try to work with you.