No I never messed with this NWNCX feature.
However I was trying to make SetAnimLoop function and there was problem with server-client mode. Anim loop is changed however client won't see a change until he reloads the area (if he is in it at the moment of calling the function).
I suppose the same problem will be there.
This is solveable but there must be a custom server-client message to tell client to do that as well. Which is a bit problematic due to the NWNX plugin architecture. The actual modularity in plugins means that either you get nwnx_connect functionality or setanimloop functionality. Anyway, solveable...