perhaps this feature has been asking by others, but I dont know.
I wish there is an auto installer script that can run on ispconfig like what fantastico/installatron/softaculous can ran on cpanel/directadmin
Softaculous developer seems very nice and try to make as many as possible script can be installed on various panel.
http://www.softaculous.net/
Other options is simplescript, it's free, hosted installed on their servers but can integrated well with many panel. hopefully ispconfig and simplescript developer can works each others.
http://www.simplescripts.com/webhost
below is list of script supported by simplescript
http://www.simplescripts.com/script_list