I don't see any issue with enhancers if they are proven to improve speed running. This isn't boxing, where your brain gets smashed to pieces if your opponent is 20% faster. People wouldn't be using anabolic steroids, which do permanent damage. There's literally no issue. It's the same as using glitches. The ultimate goal is to run games quickly around a set of established rules, adding new rules just because sports have them makes no sense. We already know caffeine is fine, so we already have a precedent that stimulants aren't an "unfair advantage"