Have units in multiple command groups

Hi everyone! I just had the thought, that this might be a cool feature to add in DE. Let me elaborate. So the idea is to have units not in only one, but more command groups at the same time. An example: You have your drush in group 1, your scout in group 2 and your whole army (scout+drush) in group 3. If you want to select your scout to go scout, just hit 1 and go scout. Then, if you find a weak villager, hit three and attack with your whole army. This basic principle would apply for many different scenarios, where you divide your army into sub groups which you want to unite again at some point.

What do you think, could this be a useful feature in AoE2:DE? I think it would be nice to have and also not a gamebreaking mechanism.