I have the destructible gate. It's fine when it's raised, but when I lower it, it just became unselectable. So I copy-pasted the flags from the raised version and now it's selectable. But I still can't drag-select it. I wanna be able to select multiple gates at once and lower them all. Works when they're raised, but lowered.
Not sure but there's some flags or select priority to tweak as well. Combat unit has priority over building, drag over them will only select combat unit etc. Did shift-click (add unit to selection) still work on these gate ?