> can you add an option to modify or set attribute of zip file and file inside
> zip?

Fileattributs are set to +a if you've disabled settings->preserve file date/time.

> and maybe another great feature is to set modified file to a specified date and
> time
>
> so when a new mame came out i can set all new and modified zip file and roms
> inside zip to the mame release date and time


See above. You can set all sets to e.g. 01/01/2004 00:00, do a scan, rebuild, whatever and if the 2 preserve date/time options are disabled (archive and file), the flags have changed.

Roman Scherzer
ClrMamePro