[wp-hackers] Users being created in master site and local site

[Robert Lusby]

Hello,

If a user is created on a single site in multi-site, and then deleted, 
that user remains in the Network Admin user list.

This then prevents the user signing up again.

How does a site admin, with access only to their local site, ensure that 
when deleting a user, it gets removed from their local site, and the 
network site?

OR ... when a user is created, create that user in the local site only 
(and not the network user list).

Thanks,
Robert