Would you use psychic investigators in a Call of Cthulhu campaign?
Or maybe you already have used this option but operate under your own "house rules." What kind of balancing issues of any did you find if any? Plot devices for enterprising Keepers?
For your reference, 20 years ago, the Chaosium-affiliated Different Worlds Magazine (#26) published Randy McCall's "Psychic Power" article for use with the 1st Edition of Call of Cthulhu. You can find it re-printed in part at http://www.geocities.com/perrycharb/dapsion.html .
The D20 version of Call of Cthulhu more formally puts forward the psychic ability option (at the Keeper's discretion).