All cats are trainable. Even old cats can learn new tricks, although they tend to be less malleable than kittens. As for the Bengels, I have no experience with the breed, but I've read that they are the feline version of wolf hybrids. In my opinion, wolf hybrids are lousy pets for most people and the same may be true of Bengels.
:bs:
Oh lord no! My cat Skipper cant even learn not to sit on the table, even if we are right there too. Its as if she dosent give a **** about our opinions. Other then problem cats like Skipper most cats can learn to not do something... while your there anyway.