We will update the Add domain page not to ask details and try to fetch it.
Regarding your issue with installation from Softaculous Remote if you can open a support ticket we can check it for you.
For the scripts not available in your cPanel if you have admin panel access you can enable the scripts from WHM -> Plugins -> Softaculous Admin panel -> Software :
http://www.softaculous.com/docs/Enable/Disable_Scripts