Originally Posted by edge
I can still get out of the users SSH dir and read a lot of stuff when SSH'ing with a test account :/
Sure, first you will have to install a patched SSH daemon as chrooting is not supported by SSH by default.
See step 2 in this howto:
Then you will have to enable it in ISPConfig in the file config.inc.php, set:
$go_info["server"]["ssh_chroot"] = 1;
The user account will be chrooted for every user with SSH enabled that you create or update.