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The "don't use the ZIP64 extension" flag is a good idea, zipfiles that use this 
extension aren't readable by the infozip tools (zip and unzip on most unix 
systems).

I'll add tests and documentation in the near future.

The version of zipfile that I'm currently using also contains a patch for 
speeding up the opening of zipfiles, for the type of files I'm dealing with 
(about 11GByte large with tens of thousands of files) the speedup is very 
significant. I suppose it's better to file that as a separate patch after this has 
been approved.