No! 'identifier?' does not check whether a syntax object represents a variable reference, given 1) identifier macros and 2) #%top transformers for unbound variables. If you really, really want to check if something is a variable reference, 'local-expand' it and look at the result.
Oh, yes, of course. All the more reason to hope mzscheme supports MWBoR. (Eli's email suggests it does.)
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