Yes. I was just thinking that it can happen automatically if you settle in a gravity, too far from your original one, but close enough that you can.
Okay, but what does that do to the value of GenMod/BioTech? If I can just dump colonists on a body and wait for them to change species grav and/or temp tolerance over time, then there is definitely a point at which I shouldn't bother building Infrastructure, LGI, and/or GeneMod Centres.
I certainly (and I suspect other players do) already view BioTech and GMCs as "luxury goods" that my empires don't bother with until well into their industrial development -- or as part of specific scenario set-up. If I want a "The Moon is a Harsh Mistress" feel then I need 'Lunies', but if I'm playing SPACE:1889 my British Empire has no need of (or desire for) 'super-humans'.
Which brings up the point that in some scenarios, I actively
don't want my population mutating to meet colonial conditions. If I set up a 'John Carter of Mars'-inspired solar system, my Martians, Jovians, and Earthlings need to stay recognizably different.