Marcello Spinella:
If someone in a roomful of people drops acid and her reality drastically changes while no one else in the room notices, that's one thing. If she drops acid and everyone else in the room also sees the altered reality, that's different--reductionistic attempts at explanation notwithstanding.
Well,
here's an interesting recording of an acid-dropping experience (probably) which affects the sober onlooker.

What you'd like to see is a new law of nature. But the powers are expressed by means of the laws of nature. Forgive me for returning to my tired "art analogy" about reductionism - but art is not a property of the atoms used to make a work of art. Meaning is not a property of the pixels of your screen where you're reading this sentence. I can't manifest my message directly into your consciousness, I have to use what's available, language, writing, computers, networks, my ability to express myself coherently and with sufficiently correct grammar, your ability to read and comprehend, ...
The powers need a means of manifestation, too, for you to experience them. If the means of manifestation is a dream state, or an otherwise altered state of consciousness, the powers can manifest experiences of flying, swimming in the earth, visiting exotic abodes of existence and so on. If the means of manifestation is waking consciousness observing a gauge, your're setting tighter bounds on what the powers can manifest.
Yes, this sounds a bit disappointing: there is no "safe", consensus way of having the powers verified and pre-packged for you, i.e. added to generally accepted opinions of what should be possible. No, there is no Hogwarts School of Witchcraft and Wizardry.
Marcello Spinella:
I'm not really interested in developing these myself. The ethical ramifications of having them are beyond me. Would I put on a cape and fight crime? How could I not?
Are you fighting crime now, without the powers? How could you not? What kind of excuse is "I don't have supranormal powers" for not doing anything about crime?
Cheers,
Florian