Apple chief Steve Jobs last night held a rare direct chat with a user to explain the ban on cross-compiling code in the iPhone 4.0 SDK. The company co-founder directed Tao Effect's Greg Slepak to a post by tech writer John Gruber that notes Apple likely wants to better determine what new features can be added. If Apple explicitly allowed Adobe's Flash-to-iPhone conversion or MonoTouch, it would let these third-party tools have much of the control over when features are exposed to developers, Gruber said.