> Agreed. Only thing missing so far: a SRFI for parameterize ...

I haven't done a comprehensive survey but many implementations of
Scheme already implement "make-parameter", "parameterize", etc.  (but
at least Chez, PLT/MzScheme, Larceny, Gambit-C, Chicken, Gauche, and
SISC have it and others have similar functionality under a different
name).

So it should be easy enough to submit a new SRFI for parameter objects
by taking the relevant documentation from one of the Scheme
implementations...  I'll even volunteer to do it!

Marc