TOKRB_SetRotation can set the rotation but be warned it messes up collisions, so best it's probably best to use turning impulses (and more realistic) as I (in the playerfactory forums) and dillpickle have suggested.
Also, if you never need your lander to collide with spheres or capsules, I would suggest using it as a convex body at first. If this proves problematic you could always switch to geometry based, even though I don't know of any problems.
Also, if you never need your lander to collide with spheres or capsules, I would suggest using it as a convex body at first. If this proves problematic you could always switch to geometry based, even though I don't know of any problems.