hum, don't change anything to research of aliens weapons. I'll explain the logic :
Some item give you a fake research which only unlock research patch. It is invisible to you (or it should be). For example, sniper plasma and toxigun a pre-requisite for research of powersuit. But you don't need research theses two weapons, you need only to found them in battle, and bring back to your base.
The idea is your scientists receive mission to design a better armor against theses new weapons, even if we don't know yet exactly how they work : soldier report they kills them in personal armour and it is sufficient to research better armor.
So when you bring back some weapon they unlock some research. But for using them and produce them, you need research them as normal. (maybe in future I will make two step for each weapon : first you learn, quiclky, how to use them, but unable to produce. Then, you'll learn how to produce. It's more realistic, but maybe this could be make some unwanted gameplay effects by releasing aliens weapon too quickly in xcom hands. I don't known yet.)
But there is two problems with your game :
- found a sniper rifle in febuary is too early
- you shouldn't see the research
I will investigate.
I haven't been able to use it much yet. I carry it every mission but it's hard to get deployed in a useful spot due to high TU cost and friendly-fire concerns. Also, a few times the soldier carrying it has been taken out before it could fire. I'm anxious to make it useful, though.
Try to use it like a real LMG. The guy who carry it should be cover by his friend when he run to position. He don't need to reserve TUs because he can't fire after moving so, he must run as fast as he can to reach the good position. The best position is not behind his friend, but at their side. Smoke grenade often usefull to help him to run in a good position. Often, I sent another guy with him, which carry sniper rifle or rocket launcher. They two can save the battle (or just do nothing in waiting lol )
You can also make him shot the first, before his friends run in his line of fire. For example, in farms maps, explode farms with autocannon before run to them. You can also hide him behind wood wall, and force fire throught it will clear the way and make bad surprise for aliens.
I've soured on the sniper rifle a bit because it's no longer 1-shot kill. Have to be much more careful how it's used for that reason.
In many cases the shot has so badly injured the alien that in his turn it will run away even it is not dead.