[TxMt] editing as user www for localhost

[Oli]

Hi All,

I've got localhosting set up and I'd like to edit a folder as user  
www, but

sudo -u www mate folder_name

doesn't seem to work as expected. This could be because I don't know  
the default Mac OS X www user password, I need to modify the sudoers  
file, or because sudo doesn't pass privs to Textmate when called via  
mate, as Allan seems to suggest here:
http://comox.textdrive.com/pipermail/textmate/2006-November/014625.html

Is this possible, or should I add it to the Wiki requests page? If it  
is possible, can someone point me in the right direction?

peace - oli