[Trooper117]

You can adjust prop settings on the Mk IX.. Set the relevant keystroke in your controls menu..

In a IX? really? In a Vb I can, but those keys don't have any effect in the IX. What do you mean? and what about the radiator?

Find the toggle for auto prop in the control menu.. Just assign a key for it.. and yep, on the MkIX, I've just flown it again and adjusted my prop speed.., you have to toggle the auto setting to off, then you can adjust the prop manualy.
The radiator setting unfortunately does not have a toggle switch, so on the Mk IX you can't adjust it..