Honestly, it sounds like races will be made even more snowflakey. It's hard enough with some races constantly speaking over t-comms with their own language. Especially if two of the same race happen to be traitors.
Here's a scenario: two Vox are speaking to eachother with the mini-hivemind about murdering a sec officer while that sec officer comes strolling in. The sec officer can't hear them, and so he gets jumped and dies because of the secondary language.
This is an...
but in my opinion I think we should just keep it balanced and not add secondary languages, especially when most species already have them.