As long as we don't have some kind of touch based screen type standardized, click-able cockpits in a combat sim is something of a fun "extra". It's fun to poke around with but impractical as *curseword*. Maybe some of you (self-masochists?) take enjoyment in trying to control stuff like radiators and control-surfaces with the mouse, mid-combat. I, personally prefer to just slew those things to the HOTAS/joystick. In conclusion, it's a fun feature but far from game-breaking. There are more important stuff that makes up a good combat sim, co-ops for example....hrrrm.
P.S It's things like click-able cockpits that was partly to blame for the failure of CloD, the team was too ambitious -yes they were- and tried to do EVERYTHING but that led to many half-finished or half-hearted features. I hope too see more of a focused approach on the new IL-2 title(s).