Hang on, hold up. I appreciate that horse-riding and wolf-riding are two very different things; but the main part of technology is not the application, but the idea. The mentality. The possibility. The basics. Reins, saddles, animal taming, breeding, breaking in, mounted combat.
Perhaps some sort of research bonus to hypothetical wolf-riding?
As an outside observer.
Reins, saddles and breeding are hardly basic as people rode horses for hundreds of years w/out them. The basic thing is taming an animal and learning to ride it. Horses and wolves have extremely different gaits, meaning they would be ridden differently, and extremely different behaviors, meaning they would be trained differently.
The "idea" of riding a horse is extremely useful of course, but it seems that everyone already has that. We all started with the tech tree revealed, knowing the general effects it would have. To me, that seems to indicate that people still have stories of before the Age of Ashes, they pass on somewhat accurate tales of what the old empire could do. This is how we are able to reproduce thousands of years of technological invention in a few short years. We already know that stuff is worthwhile, we just need to relearn it. But that relearning process involves recreating the stuff that was lost, having people teach themselves how to be trainers and riders for example. Without anyone to teach them, that takes a while. Likewise agriculture means having people who know how to irrigate, archery means developing the crafts of bowsmithing and archery, etc.