[racket] a few small Scribble questions

If I use `racketgrammar' to define a grammar, and then want to refer to 
one of the non-terminals within it in subsequent text, can I get it to 
appear in the same font?

When using `racketblock', can I get an identifier typeset in the same 
style as a syntactic form without having previously documented it using 
`defform'?

(These two questions arise when writing about toy interpreters. I want 
to discuss grammars and give examples for the language to be 
interpreted, which is typically a close cousin of Racket.)

Is there a way to typeset unbalanced code fragments? (That's asking a 
lot, I know.)

Having required for-label bindings to get hyperlinks, can I turn them 
off selectively? (E.g., when talking about something I want students to 
implement using a teaching language that happens to have the same name 
as something in full Racket.)

Thanks. --PR