I think having Kirk seeing Spock in the hallway, first thing in the morning, and saying something like, "Oh, I love your hair! That looks cute on you ..." kind of thing would be great. But there seems to be a lot of resistance to anything like that. .
If course there's resistance to that, because that's reducing the characters to stereotypical ideas of female behavior, and second, it's out of character: "Where's the logic is commenting on my hair?"