Kaisoku said:The problem with Mounts is twofold:
1. It follows the same problems as the Summoning/Animal Friend problem. If you have a second creature you control it can take up more time at the table and thus hurt peoples feelings, or something like that..
The main advantage of a mount over a summoned creature is in general, the two work together. What they could do is just give a mounted rider a suite of at will, encounter powers that they can use. They would consume the person's action as well as the horses, so you wouldn't be getting any additional actions.