Take a look at my reply, we're doing the same damn thing!
It's probably rather common.
An other variation would be to keep your feet in a 45° and then keep doing and landing on every stair edge
Never seen someone else doing that, it's insanely fast if you can master it :D
It's not dangerous i think though, wooden stairs works best indeed :p
I would like to learn to do it hands free, one foot in front of the other (forward and down to the next step). I can surf a bit without grabbing the rails, but only rarely make it to the bottom. Definitely needs the perfect wooden stairs to get maximum flight time!