I don't follow Linux USB development closely enough to be able
to tell if someone is already working on these things.
Kernel 2.6.27 will get usb gadget improvement, and a new composite
framework as see in the 2.6.27-rc1 short-form changelog,
http://lwn.net/Articles/291839/ :
...
David Brownell (50):
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usb gadget: split out serial core
usb gadget: use new serial core
usb gadget: descriptor copying support
usb gadget: composite gadget core
usb gadget zero: split out source/sink config
usb gadget zero: split out loopback config
usb gadget zero: use composite gadget framework
usb gadget serial: split out CDC ACM function
usb gadget serial: split out generic serial function
usb gadget serial: use composite gadget framework
usb gadget: RNDIS cleanups
usb ethernet gadget: split out network core
usb ethernet gadget: split CDC Subset function
usb ethernet gadget: split CDC Ethernet function
usb ethernet gadget: split RNDIS function
usb gadget: new "CDC Composite" gadget driver
usb ethernet gadget: use composite gadget framework
...
