I dunno, if they had even just some basic ideas for things like the medkit, wouldn't they have been developed for use in our regular human-vs-human wars?
Requiring an alien weapon researched would be pretty straightforward I believe, as there's already STR_PLASMA_DEP1 and 2 that achieve a similar effect in order to let you unlock the Plasma Cannon by researching either the heavy plasma or plasma rifle (plus the corresponding clip).
But with lasers requiring elerium thing I just meant that though you could still research laser weapons right off the bat, you'd not be able to build them.
Anyway, we have a few other dead-end or fluff-only research topics, something that could perhaps be improved upon.
That old idea of autopsies being necessary before a body can be sold (gotta make sure it's safe, y'know?) would be great, but I don't think it can be done with just ruleset editing sadly.
Interrogations are pretty pointless other than psi, hyperwave, and the alien-origins-martian-solution-cydonia-or-bust sequence. I guess the Navigator and Engineer rewards are a good way of finding out how the game works, so maybe Soldiers would yield research in alien weapons? But instead of random, it'd go up from the weakest (mind probe) to the strongest (blaster launcher).
Alien Entertainment could be a psi-research trigger - the flavor text mentions it uses psionics to stimulate the brain, and it sounds like a nice reward for successfully raiding a base.
It'd be neat to have Alien Food and Surgery give something as well, but it couldn't be anything important given how rare abductors and harvesters are.