This is for people that know about tumble and how it works.
Would a client sided vehicle work? And if it does, the vehicle used in the ski's tumble wouldn't have to be used to create the mod. Maybe it would work as a vehicle with no-collision, and the rest could be client-sided.
Pros: It wouldn't lag the server, it wouldn't have the
problems listed in this post, and other people wouldn't have to look at you when you die standing up, and it would keep it fun for those who liked the mod.
Cons: It would lag you, because of all the other players tumbling, and you can't disable it at any moment because it is a client-sided mod.
I hope someone decides to make this.