One good use about tapping is the large interval leaps that you can accomplish fairly easily because your using two hands. It's fairly easy to recognize a tapping part in a song because of the jumps in the pitch.

Like tapping the 12 on high E and pulling the open e. Ex. t12p0
Stick some left handed legatos (hammers and pulloffs) in there, allowing you to blaze through an octave quite rapidly.

For multiple string tapping, I've been trying to barre the lowest common fret with my index and using the rest of my fingers to do the work. Requires a good stretch at times and also the ability to mute unwanted string vibration. Tough stuff.

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