I'm reading Patrick's notes to Berman and Pillar in "Fade In", and frankly, I'm just facepalming. It's his character, he can do anything he wants. But he's really painting himself into a corner by wanting to move in those directions.
He complains that if they go in Pillers direction, we'll eventually see them singing "Row Row Row Your Boat"?? Better that than basejumping or parachuting from outer space which are some similar directions that Shatner took in being more "Humorous, lighter, swashbuckling."*
* I hope what I'm trying to say there gets across. Stewart seems to want to avoid some of the pitfalls of the TOS crew, and turns around and repeats different mistakes. And does it WORSE.