Cart dash, duel arenas

[What is the actual item/mechanic/thing being targeted?]

[What would you like specifically changed about it?]
Please, make one of the existing arenas to have all the rails cart dashable.
Or at least fix /warp duel3 which has cart dash, but there is a death region issue so this arena cant be used really

[Why do you feel that this change is needed?]
Some people, including me, want arenas to have cart dash, but due to balance reasons the cart dash is removed. Why cant we have a separate arena with cart dash for people who want to use it though?

[Anything else you would like to note]