!st suggestion:
Probably not possible with the way WGT creates the courses.. they dont create the graphics so therefore having snow or rain on the course.. would require them to go to that specific course during those times of conditions and retake snapshots to use... probably wont happen.
They could create 3D vecotr graphics to somewhat mimic this, but if you think the servers are congested now and have issues... lets just say you dont want them adding any more high bandwidth material...
2nd suggestion:
The game is still coming along in the means of the Pro Shop.. things will come and things will probably go.. this part takes time due to legal restrictions with the companies they are affiliated with... I doubt however that WGT will ever have "accesories" for the avatars that do anything for skill-padding.. would just be turning it into TWO imo...