Here is a clip showing a kung fu fighting competition. One of the fighters (in black) hops around and looks like he is from the Bruce Lee/kickboxing/Tae Kwon Do/pseudo TCMA/Glorified Kickboxing school of "kung fu". The other fighter in contrast has a very much solider base.
http://www.youtube.com/watch?v=xdoEQ...eature=related
This video demonstrates that one can fight using a kung fu "seatednees". I would say that it is possible for a kung fu exponent to use even a "solider" stance than this guy, during combat.