Don't stop there, do all 3-4 fingers!
Adding the pinky takes some getting use to.
If you play some longer tap lines with a band etc, your fingers are going to get tired. If you slide with the tap finger.......it's going to get sore about 5 min or 5 practice sessions of the same song.
I started using the other fingers to avoid fatigue!
Then incorporated them into the playing.
If you watch Stu Hamm, you can see quickly why using all the fingers makes it nicer. You can also make chords and use those in your playing and roots for the song, a bit tough to do with 1 finger.
You can certainly do different things with 2 or more finger tapping than just one and you might think differently in your approach to playing and writing.
I learned Stu's 3 finger tap and it's been a very useful tool.
http://www.stuarthamm.net/
Gots a new album too.
Watch M Manring also.
This guys does a decent job with sexually active.
http://www.youtube.com/watch?v=kTfzwriLjnE