Pretty much all the "magic powers" in Dune are actually just phenomenally well trained and integrated skills. The "weirding way" is a superstitious Fremen description for Bene Gesserit prana-bindu based martial arts, "the Voice" is clearly described as a technique of vocal modulation and pitching aimed at a specific individual. Even the truth saying thing is IIRC a matter of reading body language and vocal nuances. The only thing that's not a matter of training alone is the actual pre-gog.
So I'd say Pete's correct that most of it could be handled by some setting specific skills, an dother wise there would be no "powers" at all. Appropriate equipment descriptions would be key - no energy weapons (apart from the banned lasguns...), eprsonal shields etc. The officially NOT cannon Dune Encyclopedia would make a good reference, especially if one were aiming at the "classic" setting of the original three novels.
Cheers,
Nick Middleton
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