I would love to see a similar interface like in SupCom where you could see (the amount) and easily select your idle and/or busy engineers sorted by type (air, bot, vehicle, sea) and by Tech level.
I would just generally like to see for more specific selections to be made, for instance: select only bots when defining an area (that is, clicking and dragging) or only vehicles and air.. I mentioned in another thread having modifier keys for unit type and using them before making a selection. Not entirely sure how the game chooses what units get selected. It seems to be somewhat intelligent, but some more control would be great. I find selecting units fiddly sometimes, particulary air units when they are moving. Always have to select a bomber and a hummingbird as best i can and then ctrl+z at a certain zoom level. Anyway. More control for unit selection would be nice
You can just select everything and click on the type of unit you'd like to give orders to at the bottom. (I don't think there's a quick way to do this for multiple unit types, you'd have to deselect all the types you dont want.)
Have a look in the Settings at available keybinds - there's a load of options available which don't have keys assigned by default.
I have spent a lot of time in the Settings->Keyboard section, damn sure there is nothing like what i'm describing. But @schuesseled192's tip above might well help towards that