I also have expressed a strong desire to have a striker control device on my issued 19M to our folks. The problem is that our instructors are not the people who make our policy; it is a pretty stark one-way relationship down the power gradient.
I don't mind the regular vs agent sights (although I do very much mind the regulation of the agent sights since their quasi-but-not-fully dot driving nature makes for some interesting 25 yard precision issues). Honestly, aside from the quals, I have yet to carry the 26. It just does not have the capacity I need for a warm and fuzzy feeling, and the 19 conceals a lot more easily for me than the 229.