That's an interesting argument, and I think it probably crossed my mind in the past and then maybe got forgotten. I vaguely remember pop articles saying, e.g., that green-eyed people tend to have x personality traits, and blue-eyed people to have other personality traits, etc.
I'd say study those differences between tall and short etc. anyway! It would be interesting. I just tend to want to know everything! I mean, I often wonder if Italians are naturally better at art, or colors and composition, cos it just seems that way from the movies and art and architecture that I know of. Who knows, maybe there's something in their genes that makes them better. But if they're better at this, other people will probably be better at something else. It doesn't mean Italians should rule the world.
Back to the eye-color example, we were all very recently brown-eyed. Blue eyes evolved fairly recently from a single mutation. It's not beyond conception that the first blue-eyed person had certain characteristics that s/he transmitted to his/her progeny, and that would be interesting to know! Genghis Khan has fathered 1 in 200 of today's males, and maybe they're more aggressive compared to the average! Who knows! His genes are overrepresented compared to others', so it would be interesting to know what legacy he left us!
It would be interesting and you know I will read those references! I had read that about Genghis Khan. But his genes are likely so diluted it wouldn't make a difference. I think, behind the first few generations (fortunately) everyone is such a hybrid that it would be hard to sort. Even in cultures that seem to be homogeneous, if you look at migration patterns going back hundreds and thousands of years, you will see that we are all mongrels. I have to admit that I do look back. Vikings in Russia. Greeks in Sicily. Persians in Greece. Mongols in China.
I think I'll leave off now and read your references :)