I don’t want air stuff, beside missiles, and maybe balloon or similar if planet’s conditions allow for such things.
I thing it’s fully credible to not have access to air force in Shadow Empire universe. Air is the most difficult tech to master, even more with planet with low/high gravity, acid storms and other metal winds. Also, Air is almost always too powerfull in games, and if they are not powerfull, they are too weak too be credible...
Water stuff is more acceptable for me, it’s quite easy to have this tech, as human transport at first, machine later, gunships endgame.
I’d much prefer more control over land troops creation, and more options, like taming wildlife (a few elite lasergun warriors mounting a 9m long lizard-crab is awesome, isn’t it ?), minefield, towers and other landmarked stuff.