[plt-scheme] ffi callback

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hello,

~   I' ve begin to make some test with the 'foreign' library. But when
i arrive to the section ffi callback i read that:

'These functions are provided by the internal #%foreign, but not
re-provided from foreign. They are listed with brief explanations. If
you find any of these useful, please let us know.'

~ I made my test with the sqlite lib and without callback it will be
useless. There is a lot of C libraries that use heavily callback.
~ Is there a way to activate them (modifying the source foreign.ss
perhaps)  ?

Thanks
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