Leading isn't really difficult to deal with, just secure your gimbal to the armpost with the pin you'd normally use for low mode, you wouldn't want the rig bouncing off the arm. Might be handy to secure the top side of the arm (armpost) to the mounting point with a bungee, if you plan on fast take-offs (and to save your non operating hand from dragging the rig in position). When following, just make sure you have some kind of shin guard (tubes, construction wood,...) as well as some kind of cage out if sight of your shooting area (a tube window). Safety goggles for dust or gravel coming off the bikes tires (and a clear filter for your lens) is a must.
As far as extra gimmicks go such as the Wave or Gyros, you can always go with antlers, rather inexpensive to improvise but not ideal. When balancing your rig, you'll be better off setting a slower drop time than your used to (near neutral) as Shawn mentioned, fast drop times result in loss of control.