LegatusNewt

Reply to Units not selectable or responding once queued commands have been given in Ashes Support AshesoftheSingularity Forums

Not to bring up Sup Com again. But, the system they had is that Builder units would only be selected if you held shift with the click drag selection. Allowing you to select all combat units in an area without disrupting your builders. They would also be selected by a click drag if your box only contained builder units. I'm not saying you should copy that system but I believe it's a pretty good solution