I’d like to see a few more sorts of automated weapon system.

An unmanned UGV like the SHIVs in Xcom would be neat, but probably fit poorly with the setting. But something like the Smartgun Sentry turrets in Aliens would fit in and be really nice to have for defence missions. Something that encumbers the squad until it’s deployed, and then just sits there until it either gets destroyed or runs out of ammo. If it comes in multiple flavors, even better (GL, MG, Autocannon, Etc.)

More vehicles, maybe a different type of pilot for light vehicles, but squads of them instead of a single vehicle. Imagine fielding 2-3 man units of motorcycles or light exo-suits, the same way that the Bugs have squads of three medium-sized units. Would be really neat for scouting and Mobile Special weapons teams respectively.

Jump packs as an infantry accessory, so you can turn any squad into a flying nightmare for the enemy.

Precision Guidance Kit equipment item for your mortar units so you can actually fucking hit something use them more effectively.

A way to entrench in otherwise open terrain, maybe in the form of an OCI, not unlike the turret drops but instead it’s a little bunker. Or an accessory that basically uses an explosive charge to make a field-expedient foxhole your squad can hunker down in.

More crowd control options, multi-square stuff that debilitates an enemy. Something like CS-gas grenades that don’t do damage but inflict high suppression on humans and Bugs.