Alright, uploading a save because I found a rather ridiculous situation: The "concealable" label for weapons is borked, if only for the "Capture League" missions. That, or somehow the agents managed to shoehorn a heavy machine-gun, grenade launchers and more into a small car through the customs clearance. Check the first agent's inventory to see the arsenal on his feet.
Next, another bug visible in that same save is that Heavy Machineguns can be acquired before Promotion 3 despite the 'pedia page saying so. Speaking of: What is their purpose exactly? They seem to be a way too bulky mini-gun and less efficient. Must I have power armor to use this weapon properly, or can agents increase their Strength to 80 or more? Actually, are the stats limits the same as regular XCOM?
Another thing I'm not sure it is a bug or an unfortunate case of a failing mission scenario generator: Why do I get so many missions with the same dirty, overdone wooden-fence village so frequently? I had the scenario seen in the save for monster hunts, arrest suspects, spider attacks and more. For more hilarity this particular example is meant to be placed somewhere in Europe IIRC, not Africa or the like. Does having the Piratez mod installed as well somehow influence this?
Lastly, do Laser Cannons (aka the Craft gun) use Elerium to reload at the base? I'm not sure if they do, I think they don't, but you have to research Elerium and Alien Laser Weaponry to unlock them, so I had my doubts. Do Craft Plasma Cannons consume Elerium as well?
At least it seems that after all Xcom does manage to unlock bulky laser guns more or less by themselves, as I mentioned here before.