BC you will use a lot of rudder, especially on takeoff. The lines from the pedals/cylinders have enough slack in them that they never pull into a tight bend, even with full pedal. And the fittings at the cylinders are cocked forward so that the lines stay forward of the pedals, out of the way.
Marty, yes, it's just a pair of stop valves, ganged together, one for each line. To activate you step on the brake pedals while shutting the ganged valves. Allows you to park with wings level on a slope, so avoiding fuel crossfeed and overflow. But best supplemented with some sort of chocks if the slope is steep or the visit is long.
ICP sell it as an option, comes complete with a steel mounting plate for the ganged valves.