No such restrictions exist as there are already non Proslide attractions inside the park. For example, the "Fearless River" is from this company from Scotland: http://www.murphyswaves.com/ . A flowrider attraction? Bad idea for Volcano Bay in my opinion. Capacity is quite bad and the Gaylord Palms resort expansion to their pool area include a double flowrider. Universal would better utilize their limited land for more efficient attractions.