Okay I fixed the Issue, now Enhanced Biomes Rivers will count as Rivers to GT6, just like most other modded Rivers.
The Change is already in the Test Version found here:
This Version should be working for you. ^^
(note 1: The scary sounding Description is only there to make sure people don’t use that Version lightly.)
(note 2: if you use this Version more often, make sure your Browser didn’t cache the Download)