For the 1.12.2 version, could you add a config option to allow one to use the NASA Workbench to craft the T4+ rockets? (The recipes would look almost like a T3 rocket from normal GC, only replacing the heavy duty plating with the tiered plates for that rocket.) When paired with 'Disable Advanced Rocket Crafting', this would allow one to make the rockets like 100% normal Galacticraft rockets. Also, could you make the time travel system work regardless of gamemode or rocket type (ie: work in creative with a prefueled rocket)?