I´ve added a bunch of Gravgun research as "dependencies" for the gravgun DEP1, used by the Adeptas Gravgun research. This means any captured gravgun will unlock the players gravgun research. Same for flying armors.
But we probably have more such cases where multiple enemy weapons should unlock player research.
Plasma weapons especially, but maybe also for some higher end bolter weapons.
An opportunity to give captured Ork weapons some more utility for the player, Snazzguns and Megablastas (plasma) for example.
No rush, but whenever you have time and feel like it, take a look. I feel like I´m a little blind here for what´s possible, to make research more useful and multipurpose (40k mod is missing some of that XCOM feel, maybe there´s a smarter and more interesting way to do all this).