I can install Apache-MPM-Peruser and it work well.
But i want to use with ispcp.
Problem is,it want to add 
Code:
<IfModule peruser.c> 
 <Processor bob>
  User bob
  Group www
 </Processor>
</IfModule>
 
in new file (such as mpm-perusr.conf) that include into apache2.conf
This file will generate to add
Code:
<Processor vuxxxx>
 user vuxxxx
 group vuxxxx
</Processor>
 
for all virtual user.
But i'm not know "Perl" some one can edit "ispcp-dmn-mngr" to add this function for me plz....
(More.. to config mpm-peruser is 
here)
(This MPM (
MPM-Peruser) fastest than mpm-itk.
I use mpm-itk to solve error 500. It work great (no error 500 and very stable) but very slow.)