If you plan to use special farces, then these are best used in a scenario, and
not a generated battle.
Generated battles are for normal line forces meeting normal line forces.
Special farces (SAS, Spetznatz and so on) are provided as a tool for the scenario designer. They don't appear on the normal battlefield (or if they do, they belong to the army-level commanders, and not you as "Lt Col Regular Guy"
The scenario designer can then plan a situation where the eliteness of the special farces can be balanced by the setup (lack of time and so on and so forth).
Cheers
Andy