Quick update. If I have:
-servermod=@aliveserver;@AdvancedRappelling;@AdvancedUrbanRappelling advanced rappelling works from choppers. However persistence and some functions such as "talk to pilot" no longer work.

If I have:
-servermod=@AdvancedRappelling;@AdvancedUrbanRappelling;@aliveserver
Persistence works but rappelling does not.