What would be interesting is if you could, for example, place a tank in one of the "main slots" and it'd be a larger unit, or place it in the reserve slots and it'd be a small attachment. Sounds like a good, streamlined way of handling it.
Commandos are in the BlackICE mod, and as far as I understand they are these "omgz l33t specops" units that significantly add to the division's fighting ability, but are very small (300 men or so) and cost a good deal to create. Would indeed be interesting to have in HOI4. Not something you could attach to every single division, but you could have "elite divisions" that you built in very small numbers, and which performed a bit better than your regular forces.
Commandos are in the BlackICE mod, and as far as I understand they are these "omgz l33t specops" units that significantly add to the division's fighting ability, but are very small (300 men or so) and cost a good deal to create. Would indeed be interesting to have in HOI4. Not something you could attach to every single division, but you could have "elite divisions" that you built in very small numbers, and which performed a bit better than your regular forces.