Hmm... I never really considered Quality. So no, there's only one quality for the Rocket Assembly Kit. I'll see if I can add quality, though that would require me first learning about how it works.
edit
Never mind, I had the testing environment set up incorrectly. The Rocket Assembly Kit can be produced in higher quality. I'll see what the issue is in mod compatibility.
edit
Not something I can fix presently. I'm on the 2.1 experimental build, and the Quality Rocket Parts mod isn't updated to 2.1. There's a Quality Rocket Parts 2 mod, but I can't get that one to work. I've also noticed that PlanetsLib is trying to define different rocket parts recipes per planet, which I may need to support - but don't know how to.