I'm not certain what skeleton I'm using, I just added the mountlines from the various captains and generals to the standard bearers.
He uses his sword to attack enemies but the standard droops in front of him to the point that it touches the neck of the horse, so that during combat it sometimes passes through the neck of the horse. Looks odd.
But the standard bearers are not too bad really. What I want is the roman centurions and the greek officers (of course without the shield). But when you try to mount them like I did they just stand up inside the horse creating an odd centaur.

Earlier in this thread I tried doing what you said and it turned out that it could be done, though the results were like the centurions. So I wondered if it was possible to change a few things to make the officers actually mount the horses. I just figured that I did something wrong.

So if you know how to mount officers and centurions I would love to see a paste of it.