Multisite compatible?

Hi.

Is this plugin really multisite compatible? I’m using it in one of my multisite environment, so far it seems working correctly. But there is something I don’t understand. Please enlighten me.

I installed this All In One WP Security & Firewall plugin and network activated it. On one of the site’s firewall, I turned on the “Enable Basic Firewall Protection”. But on other site I saw it is turned off. I read the information message, it said:

The firewall functionality is achieved via the insertion of special code into your currently active .htaccess file.

Correct me if I’m wrong. In a multisite environment, all the sites use only 1 single .htaccess file, don’t they?

If I change any setting that saved in .htaccess file, the setting should affect on all of the sites, shouldn’t they? The setting should be synchronized across all the sites, I think.

http://wordpress.org/plugins/all-in-one-wp-security-and-firewall/