Honestly I think focus shouldn't only be concentrated on Vasudan mods - Most mods actually seem to ignore the Vasudans and make them more of just a 'helper' sort of race - An unimportant one that is there just to help the Terrans. For example in many campaigns like Derelict, INFR1, Warzone, the Vasudans have no real plot purpose except to help the Terrans. Hell, they didn't even appear in Blue Planet. In these campaigns new ships would hardly get involvement except to be there and look pretty.
Most campaigns feature the Shivans as the main antagonist. And as we've seen, that gets old quickly. Honestly I've gotten sick of killing Maras and Nahemas left and right - I'd like something new. The addition of high-quality Shivan mods into the mix would really liven up new campaigns since most of them have Shivans as fighting.
Don't get me wrong, the Vasudans SERIOUSLY need mods as well, I'm just saying there's no reason to neglect the Shivans.