Change domain mounting point?

[2xmy]

I have some domain-alias' that I need to point to another folder. Instead of them all beeing mounted in /x.xx/ I would like them to be in /htdocs/.

I have managed to solve this task by changing this file manually:
/etc/ispcp/apache/working/ispcp.conf

Is there any more elegant way to do this? I can't seem to find any way to change the mounting point through the control panel (ispcp) after the domain has been set up initially.

Even if it is not through ispcp there might be some more elegant solution than to open ispcp.conf and changing them?