There are currently 5 native races, Scavenger, Enfi, Thresher, Tinker, and Gaiad. Right now all of them *except tinkers* are less then useful to have around. In MoO2 natives were something you wanted to get because they were specialists, not overly flexible, but useful for a specific task. Perhaps we could do something like that here. Some possibilities follow.
Scavenger (3 point race) .5 trade, 2 Industry, special ability diggers +1 metal per scav if mine is on planet (1 mine can support 4 scavengers), perhaps boost their environment tolerance to be equal to Yoral (rats in the walls)
Thresher (4 point race) 1 trade, 2 industry, special ability harvester +1 food per thresh if farm is on planet (1 farm can support 4 threshers)
Tinker (6 point race) 0 trade, 4 industry, 1 science (slight stat alteration, cant see them caring about trade according to their writup)
Gaiad (3 point race) 0 trade, 0 industry, 1.5 science (science stat boost), special ability planet whisperer if a gaiad is transported to a garden world the option to be terraformed to a paradise world is unlocked for that world, Gaiads would not be able to be transported from a world if the base Gaiad population is less then 5 mil
Enfi (4 point race) 1 trade, 2 industry, special ability boss is watching +1 industry each if outnumbered by boss race population (ie gremak)
Right now they are just another annoying event, but with a bit of tweaking they could be another resource that you need to protect.
Just an idea (and probably impossible to implement anyhow).