[plt-scheme] plt-r6rs --compile | Any way to get a parallel build?

The automatic dependency based compilation of r6rs code in PLT is great.
But it sure would be nice to have a "make -j" style parallel build
functionality as well.  Whenever I'm editing a file that's near the root of
my dependency tree (and have to do a full recompile each time) I start
wishing for this...

Is this on the drawing board at all?  Or (wishful thinking) available but
not documented?

Cheers,
-Ryan
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