Hello Salty, Belgianevo,
It is some time ago that I made these changes, but I think that I designed separate driving pitch controls, one for each VSP, and a common rudder pitch, both together.
The limitation is that the simulation doesn't allow separate control of pitch and RPM, only a combination of both, where pitch and RPM are linked by a law, well to be defined freely, anyway not controllable in the game.
Practically, it means that there is no RPM setting, full power is permanently available, thrust is set by pitch only, driving or rudder pitch.
Transforming the VSP rotor tug into a VSP tractor tug can be done, although the size and reaction of the skeg can be difficult to simulate realistically from scratch, its stall characteristic is indeed difficult to foresee. I can simply mix the VSP rotor tug with the skeg of the Bugsier2 , and of course after having suppressed the stern rudder propeller. After that, some hint about improving the simulation would be be highly appreciated: I never handled such a monster by myself, the design is the result exclusively of computations until I receive an expert advice for ships I don't know.
But it can take some time, as I would need to dive again into the editor.
Regards,
Luc