Well,i think TigerAce is in dire need of a rework and it fits to the theme of the doctrine. And keep in mind that the Ace doesnt have to get the aura buff. It was just a suggestion. Thereby Wehrmacht and OKW commanders should be designed independently.
HEAT rounds and "Extra Equipment" are abilities that could fit very well.
But lets wait and see in which direction the mod team wants to go.
Well, IMO some combinations for commander abilities would be too meta or threaten the position of other commanders, for example:
- Tiger + HEAT (Tungsten). This would easily make the Tiger the strongest heavy tank, having the mobility and "low" cost of a Tiger with the damage output of a King Tiger. It can already beat an IS2 quite consistently, so it doesn't really need HEAT. You'd have to replace HEAT with Combined Arms or another ability in this case.
- Tiger + Assault Grenadiers. These are arguably already the most prominent abilities on mechanized assault, so they shouldn't both be on a new commander to prevent one commander outshining the other. Balance team would have to choose one or the other.
- Radio Intelligence + Ostheer. I could be wrong, but I think this would be far stronger for Ostheer than Soviets. Ostheer always has all counter options available to them, because of their linear tech. These counters also tend to be the best. Soviets also don't get elite infantry with radio intelligence doctrines (unless you count commissar), which makes it hard for them to compete in the infantry department. Ostheer infantry tends to be effective enough regardless of doctrines.
Reworking the Tiger Ace in the OKW commander would seem the best inbetween option to me, if the balance team also wants to rework assault grenadiers and wants to use the unused Tungsten voicelines (http://www.youtube.com/watch?v=dtDNG3nJPL8&t=2m2s).