[plt-scheme] R6RS and read syntax

Hi

Continuing my R6RS vs. MzScheme woes...

Is there a way to import read-syntax into an R6RS program? It doesn't  
seem to me that the standard covers it so, unless there's something in  
mzscheme for that, I must continue to use (regexp "...") instead of  
#rx"...". And in '() it's worse. regexp-match* will give me an  
immutable list, but '(...) will give me a mutable one (and cars and  
cdrs will break on one of those).

Is there a way to overcome the read-syntax obstacle in mzscheme?

Thanks for the help,

   - Filipe Cabecinhas