I've been asked to write up my current issues with the Health Care promotions as they currently stand. This is going to be a little long, so bear with me.
The current Health Care promotions chain is:
All of these promotions are limited to Health Care class units only. Shaolin Monks and a Humanitarian leader's Recon units can be granted Medic I only, and Great Doctor, Ngai Missionary, and Supply Train start with Heal. It looks like a unit can get any promotion for free through its own XML or leader traits, but a building-granted free promotion has to go on a legal unit. (Look at the Combat I promotion on Flavian Amphiteatre.)
There are two problems that I see with these limitations.
Problem 1: Red Cross/Incubation Center grant redundant promotions.
Red Cross grants the Medic 1 promotion. By the time you are able to build Red Cross, the Health Care units you are building will have Medic 1 automatically. The same thing is true of the Incubation Center and its Heal promotion.
Problem 2: Heal promotions that don't do anything.
I tested it myself, and Heal is a SELF-healing promotion. It does not affect the healing rate of any other unit. So Great Doctor and Ngai Missionary can't use the Heal promotion at all (because they have no combat strength) and Supply Train can barely use it (its Strength is 3, so it's likely to be destroyed in combat by any other unit).
Suggestions:
The current Health Care promotions chain is:
- Herbal Cures (Healer and up)
- Medic 1 (Apothecary/Monk and up)
- Medic 2 (Surgeon and up)
- Medic 3 (Hospital Ship/Ambulance and up)
- Heal (Medic and up)
All of these promotions are limited to Health Care class units only. Shaolin Monks and a Humanitarian leader's Recon units can be granted Medic I only, and Great Doctor, Ngai Missionary, and Supply Train start with Heal. It looks like a unit can get any promotion for free through its own XML or leader traits, but a building-granted free promotion has to go on a legal unit. (Look at the Combat I promotion on Flavian Amphiteatre.)
There are two problems that I see with these limitations.
Problem 1: Red Cross/Incubation Center grant redundant promotions.
Red Cross grants the Medic 1 promotion. By the time you are able to build Red Cross, the Health Care units you are building will have Medic 1 automatically. The same thing is true of the Incubation Center and its Heal promotion.
Problem 2: Heal promotions that don't do anything.
I tested it myself, and Heal is a SELF-healing promotion. It does not affect the healing rate of any other unit. So Great Doctor and Ngai Missionary can't use the Heal promotion at all (because they have no combat strength) and Supply Train can barely use it (its Strength is 3, so it's likely to be destroyed in combat by any other unit).
Suggestions:
- Remove the Heal promotion from Ngai Missionary.
- Change the Heal promotion on Supply Train to Medic 1 or remove it.
- Decide if you want Great Doctor to be a healer unit. The problem with this is that the Great Doctor is going to be limited to its initial promotions. Whatever level of Medic it has will mark the point when it becomes obsolete (unless it has a special Medic IV promotion?). Example: If Great Doctor has Medic II, then it becomes obsolete as a healer once Surgeons can be promoted to Medic III.
- Change Heal to an all-units promotion. I think changing the prerequisite to Combat III would work.
- Red Cross needs one of two changes. Either change Heal as I suggested and change Red Cross to Heal, or open Medic I to nearly all unit classes and leave Red Cross alone. If you require Medic I to have Herbal Cures, then normal units won't be able to promote to it but Red Cross could grant it.
As far as I can see there were no early repair boats.
Trained (NOT wild) Animals and fast Mounted units would be Anti-Recon as I feel that Recon units should be much weaker than they currently are but extremely strong at withdrawal, counterable by the faster units. 
