I know some rescale the horse rig for pony poses to make it easier to make pony-rider poses to match. The poses looks just like regular sized poses and there's no way to save the size of the rescaled rig either, you'd have to resize it every time you reload the rig.
I can't for the life of me remember how to rescale rigs but it shouldn't be too hard to find on the internetz if you want to try it
You should explore this pose category on CC Database to see if the poses you're looking for are made. If you can't find what you need from there, you can ask if someone could make you some at Request section
That looks like a bedding set @Elin-Fredriksdotter made, but I am not entirely sure if it's still up for download somewhere. Peersonally I don't use any bedding objects in my stalls, but the terrain paints from TSR's equestrian surfaces set.
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