I know of no opposed piston airplanes with reverse pitch propellors. RADIAL engines had props that reversed.If you were in a Baron and saw reverse on the throttles, then you're looking at one that's been modified, either with different engines, or by using the throttle quadrant from another airplane (remember King Airs are a Beech product too).

The sim outhouse link above tells you the basic process. However, this involves a complete rewrite of the AIR file engine thrust code, is best created by an expert, and a gauge used to modify the throttle's behavior.Hope this helps,--Tom GibsonCal Classic Propliner Page: http://www.calclassic.comFreeflight Design Shop: http://www.freeflightdesign.comDrop by! ___x_x_(")_x_x___