That 4-button bar control's well worth the added expense. Use the [+], [-], and top [F1] buttons contantly in the saddle, but the bottom [F2] only for walk mode. [F1] scrolls through the TCU pages. Long-press [+] toggles MicroTune.
Well-designed system from an ergonomic standpoint. Rotate the control on the bar to get the optimal orientation for your own hand.