I think that banning players because of older Gentool versions is not a good idea.
Gentool ver 6.2 is the last version that supported Shockwave camera-height value, new versions revert it to ZeroHour standard,
so you have 2 options:
1. Play without gentool and have higher= better camera height.
2. Play with gentool, but - lower camera height
(camera is closer to the ground so you see less on screen than regular Shw player without gentool)