Because Multi Crew Experience supports all FSX aircraft, even without their special "fully supported" aircraft treatment. C130 pilots may find the below video of interest.

The C130 is flown with a MCE co pilot and RC4... ;)

http://www.youtube.com/watch?v=ZzZNxsPBi0g&list=PL7227316D8D4AAA3E&feature=share&index=30

If the aircraft were to receive the full MCE conversion, then a flight engineer may also be simulated!

If C.S intend to develop the Herc further?......(Glass cockpit and HUD.?) :D

Best Regards
David