If you want using php-fpm from php55m as alternative 'standard' php-fpm (from php-branch). The same way via 'php selected' in 'webserver configure'.
For 'single php', better using php53u as 'php-branch' (to minimize problem for php53s) and then install php53m, php54m and php55m. After install various phpXYm series, you can switch your 'standard' php-fpm with one of phpXYm series via 'sh /script/switch-php-fpm php55m' (example for php55m).
Switch process will not include re-config php-fpm config and just modified /etc/init.d/php-fpm.
