No, wing chn is fairly diffrent from JKD and already has its own philosophy, hence there would be no reason to copy a style and call it something else because it incoperates new ideas. He was trying to make a style that anyone could learn, and for them to utilize techniques that worked for them, as such it is not exactly a science, unlike wing chun. It is not bruces interpretion of any style in particular, but fighting in general. If you wish to gain an insight into hes ideas about it, watch 'Bruce Lee, the lost interveiw" it offers a better level of insight into what his philosophys on fighting were and what JKD is moreso than i can say here.

but wing chun focuses on the fight itself more than the style, when you start off you learn basic techniques footwork etc, then you learn how to apply them to an acuall fight situation (like most martial arts), no pulling of punches, no set pattern, just precise and acurate punching and trapping. this can take a few years too achive, but is essential to street conflict.

Does anyone know if Chi Sau is used in JKD?

look below...., Personally i like wing chun as a style more anyway, i just believe it taught me alot more of alot more useful stuff, but could you enlighten me to what you like most about the style (open question) as im not sure what any unique elements they might incoperate would be

We do Chi Sao at my JKD school occasionally. We also do pummeling (for JKogas!).

single hand, or double? do you use Chor Ma (Chi Sau for feet) or Chi Na (for grappling)

Tai Chi has 'pushing hands'

do most arts have a sensitivity drill or tool?

Hubad is a sensitivity drill, would trapping hands count? From a CQC style. Chin Na isnt really Chi Sau though, its it's own whole style.

Bodiharma -

We usually do single hand Chi Sao (both sides, of course). We have done double hand a few times, and Chor Ma once or twice.

We use a BJJ based groundfighting program.

CQC-close quarter combat... Hubad- opponent feads a right habd hammer strike to kneck, you block, pass,pin to chest, then you feed attack. Speed it up and then insert a diffrent attack to see if opponent can naturally react. not at all like che sau really, but still a sensitivety drill. Chin Na has other aspects to it as well though....

that donest seem like sensitivity training, more of a blocking drill.