Could it be possible to add an attribut for both stamina and stamina recovery? It would improve its integration with other mods that add attribut bonus like armor tiers and so on.
If it's already on I just don't find these with /attribute

I made a mod that allows this on fabric, on forge theres the betterparagliders mod, if you can get me in contact with the mod owner of betterparagliders we could distribute the mod, its a port of his mod