This may be a useful feature for any mod that has voice acting... if its possible. The primary advantage for this feature would be for any mod or campaign that has Vasudans in it. It would firstly require the ability to turn SynthVoice on, regardless of whether its been activated in the launcher (though obviously, if the build being used doesn't have SynthVoice, then it would do nothing). That's probably not all that difficult to code. The big question mark is whether you can force the game to play both the indicated wav file AND the SynthVoice over one another. Then all you need to do is select one of the untranslated Vasudan speech files (like those of varying length included in BR's STL campaign) of appropriate length based on the message length, and click on the "Force SynthVoice" checkbox (as I see it) and it would play them both at the same time, making a better-than-nothing simulation of Vasudan speech translation.
Is this doable? Is this desirable? Is it more trouble than its worth?