managing groups via CVS passwd file

[brendan . fitzpatrick]

I am in the process of creating several CVS projects and would like 
to manage my users via the CVS passwd file. I would like to grant my 
users access to multiple different projects without creating a system 
account for them, is this possible? 

I know how to do it by creating system accounts for each user and a 
group for each project, and I think it can be done by using multiple 
CVS password files for different projects but is there an easier way 
to do this? 

Ideally I'd like to have  password file similar to:

user1:<encrypted password>:proj1
user2:<encrypted password>:proj1,proj2

where I could grant access for different projects to each user. Any 
feedback would be appreciated. I know there is some sort of patch on 
cvshome.org but I don't feel comfortable with it.

Thanks.