Racial Migration

I have entered an alliance with multiple empires and we allow migration of races between the alliance members. This is extremely beneficial as it allows me to remove the domes from almost all my colonies (as we have a variety of native atmospheres); however, I am curious if ANY of the immigrant race's abilities other than atmosphere have any effect upon my planets. There are three methane-based races in the alliance (two members and one other has some by conquest) and they all have different modifiers to resource, intelligence, construction, etc... I remember in previous games I played (mainly MoO2 and SEIV) that individual race characteristics DID affect the planets upon which they were placed, but these modifiers are not showing in Planet Modifiers in SEV (just shows my original race statistics under Quadrant wide), so I am unsure if it matters whether I remove a race with bad research modifiers from my methane atmosphere research compounds... any ideas?

Also, it seems even if ships are created at planets that have NONE of my original race, the crews are always of that race, so I cannot find any way to create ships which are crewed by other races assimilated by my empire.