Mouselook steering's maximum pitch

Does anyone know of a way to remove the maximum pitch on a mouselook steering vehicle that is set to normal reference frame?

Basicly a way to make a normal vehicle able to do a complete loop with mouselook without reversing the reference frame and tricking it.

Reason I ask is that to use CCC combat or the like, the vehicle must face to +X.

i assume you are using mouselook to steer the vehicle?
if that is the case then all you should really have to do is get the aim vector and rotation every x seconds and feed that data to the vehicle

but without details or a script there isnt much i can really offer but the basic suggestion above