RoF heats the air. Hot Feet heats the ground. I think you're confusing the 2. Sure the heat from each spark probably absorbs into the ground where it hits, but it's spotty compared to HF heating a solid patch.
Anyone else remember the old Chun Li lightning leg kick in Martial Arts before it got swapped out for an animation that didn't leave you whooshing repeatedly at nothing if you missed? As an alternate animation maybe use that with the same glowing speed effect from Hasten on the hands but on the users feet instead.
Hot Feet makes sense to slow because it's burning the targets feet which would make them hop around like some old b&w comedy scene except for we don't have that animation so it just slows them. RoF comes from above and I can't imagine why it even has a slow.
Maybe it's me, but both Gadgetry and Utility Belt seem like they would be tech origin. I guess it depends on what's in the utility belt, but I always think Batman with utility belts and his is full of gadgets.
You can get ouro portal easy as you collect your AP badges. Inside City Hall get the Edge of Chaos badge, then go in that elevator and pop into the Recluse's Victory zone and boom you automatically get ouroboros.