Peter,
Although I agree that "absence of evidence does not equal evidence of absence", on the other hand it provides no support for the claim, either. Anecdotal evidence or testimony - as you well know from your posts on this board on creationist nonsense, for instance - is insufficient
in and of itself to validate a claim. Especially a claim about capabilities and energies for which there is no other empirical support, and which tend to disappear under controlled conditions, or apparently even in the presence of skeptics like stage magicians.
Reading your exchange with Schraf, I don't think she's dogmatically asserting that the capabilities DON'T exist. After all, as Shakespeare put it, "there are more things in Heaven and Earth, Horatio, than are dreamed of in your philosophy". She IS, however, stating that the evidence thus far provides no support for the claim of their existence. It isn't up to the skeptic to disprove a claim such as remote viewing. It's up to the advocates to provide unambiguous, replicable evidence of its existence.
Otherwise, it's just a belief...