Using it for pole vaulting was one of the ideas I also thought about, but the reason I didn't add it is because I didn't want it to interfere too much with the acrobatics style already written. I'm doubting now whether or not that was a good reason though, so perhaps I'll actually add it back in.
I also love the idea of a staff spin to block projectiles though. Right off the bat I can think of 2 ways to implement it. I'm not sure what fits the idea of OSE Stylish better. Would you suggest an action with a x-in-6 chance to successfully block projectiles, or an automatically successful block projectiles that costs 1 MP to use?
Viewing post in New Advanced or Secret Styles (and post your own!)
One thing I would implore of people creating their own styles is not to worry about doing something another style already does. You don't know if you'll even use the other one in your campaign after all! That and I think it makes sense for styles to occasionally share features, as different martial traditions will inevitably borrow from each other.
For your other question -- I kinda like both, especially because for a home game you wouldn't be limited by space and so the mechanics don't need to be written "elegantly." Instead of the x-in-6 chance though, I think what I would do is have the player roll an attack and compare their result to the roll of the arrow that was fired. It's not at all simpler or "better" than x-in-6 of course; I just like the flavor of it.