I also do this & i've never seen it done anywhere else. Cool.
One other thing I do - palm the tamper a bit and rest three fingers and thumb on the tamper "foot?". This lets me feel the basket rim with my fingertips to see where things ended up and make sure the puck surface isn't angled.
What's up with all the tapping and thumping? Based on what I've been reading in Scott Rao's handbook, even tapping with the tamper handle can lead to channeling.