Love what you added with Courier horses! I think it would be a great idea to also allow regular warhorses under Q50 to be retrained as Courier horses. No one has breeding stock of regular horses under 50Q (well almost no one), which has forced anyone who wants one to go out hunting for wild horses, of which I have not seen many. This option also helps the horse trainer skill, which, even with the training speed increase, is an incredible slog.
That is all. Thanks for listening.