creating mail only domains

hi,
is it possible to create mail only domains ?
i have gone through and create a package and features to allow only access to alter email accounts ect ect.
yet when i still create a new domain it adds the www, ftp records, which comes out of the standardvirtualftp template, is there a way to get that package to use the simple template ?

i know at the end of the day without the ability to add and remove options in the control panel a user is unlikly to find out that they have webspace enabled, but i would prefer to avoid some sneaky users finding this

regards Jav