The singlehanded roll isn't hard. Jojo Mayer refers to it as a "push pull". You hold the stick in the traditional grip, and then move it back and forth between the middle and ring finger. I learned how to do it about 5 or 6 years ago. Unless you've been playing Traditional grip for years, it is going to take you a little while to build up the strength in your fingers to really be able to manipulate the stick.
Heel-Toe technique came about from Heel Down players trying to go faster on a Ludwig Speedking. The Speedking has the "moving heel plate" on it; if you lock the heel plate in place, you can get heel strokes out of the pedal.
The Axis pedal is based in the Ludwig Speedking - which is why most "chain and sprocket" players don't like the Axis pedal, but those of us who came up playing "strap-drive" or Speedking pedals love them.
Neither of these are really "tricks", but really forgotten techniques.
The "Singlehanded roll" is a brush technique applied to the sticks; when players started playing rock music and quit using the Traditional grip, these techniques sort of became lost. All of the old timers could play this way - it's just that Buddy Rich had been playing since he could almost walk, so he spent years and years perfecting the traditional grip.
I made a crappy little video about how to do a one-handed roll.
Keep in mind that this was made using a "webcam". A few months ago I bought a digital Camcorder, so I need to make a new video to put online.
I pulled the link because my server was getting a lot of traffic.
Tim