Air bleed doors and aileron boosters test buttons are not implemented at the moment. Since they have no practical purpose in the game, they were left behind early in development... Purpose of these buttons is to test normal operations of air bleed doors and BU-45 hydro boosters on ground, during the aircraft inspections. We will implement them.
Type 81 transponder switch is actually SRZO (IFF) ON/OFF switch. We should have mentioned that more precisely in the manual. SOD is ATC/or other ground based radars signal intensifier (you can think of it as a simple transponder), which aids to the ATC crew during the aircraft guidance procedure (inbound, approach, landing, individual aircraft, group, rough - long distance, fine - precise). Unfortunately, both devices have very limited usability in DCS. However, some developers found them useful for ATC/GCI applications.