Hi,
unfortunatly, it's difficult to check content of assets before purchase.
I can't really say if you can alter a character joint, it may be possible but if that transform has some effect on the skinnnedmesh, then you are going to affect the skin as you modify that joint...
you could however, create a dummy and set it up so that it looks at where you want, and if you can parent that joint to this dummy then you can get back to a normal behavior because you have one layer of indirection between the look at and the joint to give you the chance to correct the rotation.
Bye,
Jean