Suphp Working With Vsftpd

I am setting up a shared Server with apache2 and php5 + suhosin +suPHP + vsftpd.

The Directory Structure is:

1. DocumentRoot

/var/www/virtual/website1
/var/www/virtual/website2
/var/www/virtual/website3
............etc

2. For each website I would create a system account and tie it to each virutal host(as required by suPHP)

chown -R John:group1 /var/www/virtual/website1
chown -R Mary:group1 /var/www/virtual/website2
chown -R Ben:group1 /var/www/virtual/website3
...........etc

<VirtualHost 192.168.100.44>
DocumentRoot /var/www/virtual/website1
ServerName www.website1.com
suPHP_UserGroup John group1
</VirtualHost>

<VirtualHost 192.168.100.45>
DocumentRoot /var/www/virtual/website2
ServerName www.website2.com
suPHP_UserGroup Mary group1
</VirtualHost>
........etc

3. I setup vsftpd with chroot to each virtual host.

This works very nice as long as each client has only one ftp account. But if a client(website1) wants to have multiple ftp accounts( ex. john, john100, john200), they would mess up the file ownership when they upload and change files. Since suPHP executes PHP scripts with the permissions of their owners (suPHP_UserGroup John group1, suPHP would complain their setid is mismatched because the John100 is not the suPHP_USERGROUP owner(John). I have tried Virtual Hosting with Vsftpd and Mysql, that didn't work because all the virutal users would be acting as one user (guest_username=virtualftp) when they upload and change files. I am wondering if there is ways to allow multiple ftp accounts for each Virutal host working together with suPHP. Or It is possible for ftp user to change ownership once they log in.