I posted this inquiry to a realtively-prominent researcher in
motor control, and the following answer contains some references
that might be intersting.
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Secondly with regard to your question-
there is out from December the last issue on Current Contents
in Neurobiology-motor control
with reviews about role of feedback
(either by Hasan or Laquaniti I dont remember)
A couple of years ago there was also a review by Hasan and
Stewart in a book
in the series Excersise and Sport Science Reviews
(1988 or 1986 0r 1987).
It is generally a matter of debate- a lot of things can be
done without feedback.
Actually there is also a paper by Ghez in the
Cold Spring Harbor Symposium on the Brain (1990).