I got Thecus N4100PRO NAS this summer and have been looking for a usenet module for it since then. Decided to do another search today and guess what I have found:

https://www.10741.nl/thecus-n5200pro-sabnzbd-module

flex/postgres fanboy ;) made the module for N5200Pro. I have just tried it on my N4100Pro. Works like a charm!

screenshot