Hi there! I played the mod for a few weeks now, with all different rocket silo qualities. It's pretty fun, honestly! So many designs can now work with multiple launches per silo per visitation of the ship.
The mod is not really intuitive regarding the "data" – how much does it speed it up? Of course I measured it but, it would be nice to have one of those diamonds to hover over in the factoriopedia for "Rocket raising speed" for the different qualities, if that's possible that would be really nice.

Another thing is the addition of a setting to set the rocket raising speed for yourself, maybe with 3 presets:
1, 1.3, 1.6, 1.9, 2.5 (like most production buildings)
1, 2, 3, 4, 6 (like accumulators)
1, 1.1, 1.2, 1.3, 1.5 (like weapon range)

The factoriopedia is (currently) not possible to edit and generates its values from the 'basis' prototype plus the quality multiplier, which is a value of the quality. The only way to bypass it is to list each quality separately.

The speed increase is linear with quality level, and should be easily adapted into a setting; I'm going to take a look at that later.

Ah sad, so quality isn't easily moddable, then, if you can't give any entity a quality scaling stat. I or you could make a post on the factorio forum to ask for that, I feel like there could be so many more things done with quality...

And thanks for looking into the setting thingy!