Allow the ability to make /stable bring up a GUI. This GUI would let you view and select which horse you want, and even store your current horse. Book reads: Welcome to your stable! You can summon a horse by clicking on the one you want. You can store your horse by clicking on an available slot, indicated by a fence gate. No available slots? Purchase another slot for 5,000 tokens by clicking the emerald. Use the arrows at the bottom to navigate pages, if needed. Each horse says their stats along with whether they are saddled or not. Hovering over the fence gates reads: Open Stable Slot Click here while riding your horse to store it for later use. The red glass indicated unusable stable slots. The arrows are navigation arrows. The emerald reads: Buy 1 Stable Slot Click here to buy 1 extra stable slot. And if you cannot: Oops! You've reached your max! By supporting the Empire, you can have up to 5 stable slots. Stable Vouchers can expand your stable slots past the limit at no cost. That is all. Also, I think that you should be able to expand your stables more than we are able to now.
Only because I realized I have 10 stables, and 3 stable pages. I found it tedious to navigate the pages using commands. Halfway through making this I realized there was a max amount for supportership, and a low one at that.
