It would be nice to be able to choose tajaran, vox, and so on as a secondary language. It's rare for a human to learn tajaran successfully due to the lack of a tail and such, so maybe this should be a cheap (5kp or so) karma unlock.
While some might resist this change due to the aforementioned "hard for humans to learn," it makes a lot of sense for experienced or ambitious crew to learn it given tajarans in the workplace. A sort of cultural awareness and exchange thing.
Maybe it wouldn't be a perfect understanding, with occasional words being asterisked unless the karma unlock variant was purchased.