Hi Dan,
The problem with the low-level details, in rules like WAB, is that you have to come down on one side of many historical arguments, and we probably don't have the evidence for being certain.
>>Pontic cav - hand weapon, light armour, throwing spear, shield
This seems okay. Shield use is probably a debatable topic. They could have had Persian style leg armour or some partial barding instead. I might be inclined to go for something like this:
https://www.grippingbeast.co.uk/SCRC21_Cappadocian_Heavy_Cavalry_3--product--5944.htmlSome may have been full Cataphracts, especially those from lesser Armenia.
>>Sarmatian noble cav - kontos, heavy armour. option for - barding, bow, cannot be taken unless there are horse archers
Typically Sarmatian style heavy cavalry seem to be hard charging armoured lancers on unarmoured horses. They generally seem not to have been full cataphracts. I'm not sure if there is evidence for dual armament, although I think there is plenty for bow use generally.
>>Horse archers - bow. option for - shield, throwing weapon - are nomad cavalry and can skirmish
Probably mostly typical Iranian-type bow and sword/axe armed horse archers, similar to Parthians or Scythians. Bow and hand weapon armed skirmishers with Feigned Flight in WAB terms.
>>Light cav - hand weapon, jav, shield - are skirmish and have feigned flight
That seems reasonable for Greek, Thracian (Bithynian) or Anatolian (Iranised) light cavalry.
>>Wedges
I'm not sure when wedges were used and they are probably overblown in their game effects anyway. More to do with manoeuvre than shock.