You can create separate layouts per site and configure them in component settings if component has such settings and its config is not shared.

Support of new tables in Joomla 3.2 was added. Please re-save settings of your sites if they share Users or Content (required for Joomla 3.2 only).
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But in bridge-settings it also looks like there is sychronization only from JS to phpBB. Are you sure, this should work in other direction too?

... default style selection, so each of your sites can have own default style. In most cases colours and logo are configured in template style settings, so using separate default template style allows to have different colours and logos in each site. There is no need to override default template ...

... SQL execution on component update when installing extensions in slave site. ⋅ Feature: display of site secret key in backend site settings. Read full article...

Cookie Path should always be /
Cookie domain should be either empty or have the domain name.

Hi,

Is it necessary to change Cookie Domain and Cookie Path in sub sites configuration? I mean to avoid conflicts.

Regards
Michel

... ⋅ Added ability to delete selected report rows in backend and frontend using Primary Key and Primary Table settings. ⋅ Improved filter name entered by user. ⋅ Fixed issue with loading data from 3rd-party database. Read full article...

You can clone any database tables: you will configure settings of sample database and next clone it for each of 15 sites. Or you can also clone database of any existing subsite. Please create a ticket in our Support Center and attach this template, ...

... but create a new database for the subdomains and have that database cloned 14 more times instead. Is that possible? How do I check if the template settings are stored in the database. I am using a premium template and I normally change the settings for css and index through their files using FTP. ...