Good comments above. Sure, some of the things you mentioned can can have a great effect on some systems. When you are dealing with srong electromagnetic fields, lots of things can have effect. I'm sure the shakti stones are great but the price is ridiculous. Try the "bag" from Virtual Mode, 203 929 0876, ask for their catalog, very informative. I've liked their $30 "bag" for transformers (3"x5" bag to put on top). Any little object on top of a speaker can be audible, try two quarters, one at each front corner, and a dime at the front center. This can give a richer, more spacious sound. What do the Shun Mook discs cost? But I'll bet wood DOES sound better than metal coins....
"Feng Shui" and "Floobie Dust"
These titles were once used in an edition of Stereophile reporting on some miscellaneous items from a CES show. Do things like Shun Mook disks, Shakti stones, silver vs. copper wire (the resistivity of silver is only a little greater, so is it the grain structure?), power conditioners (for example, there was a fairly interesting article in the current issue of The Absolute Sound debunking most power conditioners and filters), etc., make a difference? Is there any physical basis (in terms of an understanding of the physics) for the claims made by the manufacturers?