An alternate ending to No Horsing Around ( starting after page 5 which has been included here.
I consider the original ending canon. This is a what-if scenario. What if Simba took an extra few seconds and let his shock turn to (for lack of a better term) admiration?
Let me preference this by saying that Rafiki's staff isn't sentient. That would be a bit much, even for a Lion King TF scenario. It does seem to have (what I can only call) a sense of poetry. If, say, Simba gives himself a horse tail with it, it would mostly likely give him other equine features, should he be zapped again. This is seen in the canon ending.
Someone like Simba would have some influence, of course but ultimately, would have little control over what the staff actually does. Someone like Rafiki, who has experience in and respect for the mystic ways, would have a much better understanding and could get the staff to do anything.
It seems that the way you treat the staff influences it's effects too.