Ok woohoo finally fixed the problem after much head banging against the wall and later face-palming....
--HOW TO GET YOUR T.FLIGHT HOTAS X RUDDER FUNCTIONAL IN-GAME--
It's amazingly, stupidly simple. Diaspora wont recognise the stick correctly when it's in its default 5-axis mode (the green light on the base between throttle and stick in laymans terms.)
To get it to run correctly - for a functional rudder and throttle without manually setting them up in options - push said green light button to change it to red, which is now 4-axis mode. Viola!
Still no idea why some games are fine, others crap themselves in 5-axis but, well, it works.
Stupid nugget mistake. Now in the finest of military traditions I submit my fix, and shall self administer 3 swift uppercuts to the jaw for being the cause of the error in the first place. :lol: