So, when playing as "engineer" there's no way to test just the to-be-active portion of one's drone. It's tough to get the center-of-mass when the part you'll be dropping is large and attached. Additionally, when testing combat effectiveness, the Testflight enemies always blow-up the attached-to-be-dropped module and that almost never happens on planetary missions. Lastly, copy-pasting from different drone designs isn't possible, nor is importing part of a previous design.
Thus, the engineer ends up re-doing large chunks of work rather than being able to paste-in solid already-good design portions.
To sum up--being able to build and test parts of a drone where the fuel/batteries are assumed to be wireless and elsewhere (thus ignored/fulfilled for testflight) and being able to paste these subassemblies into new drone designs would be phenomenal. Thank you.