I've had a few instances of my smart key getting activated in my pocket by bumping against other keys, coins, etc. and I have noticed a few others complaining about the same thing.
I recently ran across this silicon skin that might help make the buttons more recessed:
http://www.amazon.com/Infiniti...=1-98
I've just ordered mine, so I have yet to test it. If this doesn't work for me, I plan to insert a thin piece of plastic (cut from a milk jug) between the silicon skin and the front of the keys to stiffen them up a bit or to make the buttons smaller (via holes in the plastic).