Softaculous has no addon for ISPConfig. If you need one, you should write them an email and request support for ISPconfig 3.
With ISPConfig 3.0.3 we will implement aps: http://www.apsstandard.org/ so if softaculous will not implement a interface for their system soon, they will become obsolete anyway as ISPConfig will support the free application catalog from aps in about 6 - 10 months.
Anything? So far i've been contributing but it appears i may have to go full fledged with direct admin. ISPconfig is without a doubt the best open source control panel but lacks popular integration such as softaculous, whmcs, etc.
Why do you complain here and not at softaculous? They are a commercial company that sell apps packages and has built its software around cpanel and if you want that they support ispconfig, you will have to ask them. ISPConfig will release a app installer with version 3.0.5. Regarding whmcs, there is a billing module for ispconfig available which is integrated into ispconfig. Sii ispconfig.org. Some time ago someone also published a module for whmcs for ispconfig.