The USB specification does not allow microUSB to be used for both charging and OTG. Read the PDFs linked to in this thread, and the comments on these PDFs. Please read the thread before replying!

I don't understand why there is still discussion to try to enable it in software. Clearly, it does not work to enable it via procfs (or sysctl). Doesn't that automatically mean you're gonna resort to a hardware hack? While OS is running how can you go more lower level than kernel? I think, we'll have to see about that 5th ID pin.