Compatibility with RCI itself when I add additional rocket silo recipes, because RCI expects that you'll be using the default rocket parts, and it won't provide you a way to ship alternate rocket parts on a rocket.
I mean, from what I have seen using Space Age Galore, as long as the ingredient in question is not used to make rocket parts in a particular rocket silo, inserters will work just fine. Using the Dieselpunk recipe (that replaces the LDS with engines), I managed to have an inserter insert LDS in the rocket's inventory.
Also, TBH, just because you change what the recipe requires doesn't change that inserters won't fill up a rocket with the items currently used to make rocket parts. RCI may add Rocket Control Units, Rocket Frame Sections, & Hyperbolic Fuel, but it can't make inserters insert those in the rocket's inventory when they're being used to make the rocket.
If you want to use inserters to chip Blue Circuits via rockets, all you need is a rocket part recipe that doesn't use blue circuits.
In this sense, if either the "Void Rocket Parts turn into 75% chance Rocket Part" or the "Voidtronic + Voidfuel + Void Rocket = 1 Rocket Part" are implemented, then this mod will become a mini-RCI and allow people to use inserters to ship rocket fuel, LDS, & Blue Circuits.