MetaOrders

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Orders about orders.
Guarding a unit is a simple one - it involves patrolling, reacting to enemies, and possibly repairing the guardee.
"Fire at Will" and "Hold Fire" would be others, as would "group one follow these waypoints while freely maneuvering to engage encountered forces" (simple in TotalAnnihilation, StarCraft and WarCraft 3).

I think these are the way of the future. Ordering whole armies to adopt offensive positions then attack, whilst being able to zoom in and see the snipers providing covering fire while the sappers run towards the enemy base, first group demolishing the wall, second group demolishing the primary target...
This should be an ingredient of APerfectRTS.