Go check out this handy little utility. Its a script plugin for Gmax, that has every single tag recognized by MakeMDL for FS2k2 and FS2k4. All the little tags have a small rollout that appears when you hover the mouse over the button, telling you what each one does, what aircraft its used on in the stock models, and the conditions it uses.
See, there's a few things you could do here (all of this assuming you are creating this in Gmax)! There's a tag called R_Aileron_Key (and L_Aileron_Key) that allows you to set a keyframe motion for the ailerons, a keyframe for the rudders (I think

) and several others that I've never heard of, nor used.
And you wouldn't believe the stuff in the cockpit! That list is longer than the one for the external model . . .
Gmax TagTool 1.0.2 (first on page)