I've never personally had the problem with ramps and pins, but then again, i've never tried running a ring equipped with ramps and pins on a SS drivetrain. However, i've known lots of ppl who have had problems with dropping chains, and who solved the problem by getting a rampless/pinless ring. As i said, the modern SS/downhill singlering-specific chainrings will also have deeper(vertically) teeth, which may also help. I've also run old-style chainrings for derailer systems, with shallow teeth but no ramps mand pins, without any problems. To be fair, it may be possible that ramps and pins won't be an issue with perfect chainline and a perfectly tensioned chain, but in my experience, such perfection is rarely achieved entirely.

All that being said, most modern chainrings for singlespeed use are compat with 3/32" chain, as are most freewheels and cogs. Nothing wrong with 3/32" chain, and a case can be made that they're superior for SS use. I like to run the fatter chains, but mostly for emotional reasons.

-rob