@c3mdigital ok, I did. At least nothing is broken :)
This is my .htaccess now:
RewriteEngine On
RewriteBase /
AddDefaultCharset UTF-8
# let add www if:
RewriteCond %{HTTP_HOST} !localhost [NC]
# not ends with an foo.bar.org domain (catch main foo.bar.org itself)
RewriteCond %{HTTP_HOST} !foo\.bar.\org$ [NC]
# url not starts with www already
RewriteCond %{HTTP_HOST} !^www\. [NC]
# do the rewrite
RewriteRule (.*) http://www.%{HTTP_HOST}/$1 [R=301,L]
# BEGIN W3TC Page Cache
<IfModule mod_rewrite.c>
RewriteCond %{HTTP_HOST} ^(www\.)?([a-z0-9\-\.]+\.[a-z]+)\.?(:[0-9]+)?$
RewriteRule .* - [E=W3TC_DOMAIN:%2]
RewriteCond %{HTTP_USER_AGENT} (2\.0\ mmp|240x320|alcatel|amoi|asus|au\-mic|audiovox|avantgo|benq|bird|blackberry|blazer|cdm|cellphone|danger|ddipocket|docomo|dopod|elaine/3\.0|ericsson|eudoraweb|fly|haier|hiptop|hp\.ipaq|htc|huawei|i\-mobile|iemobile|j\-phone|kddi|konka|kwc|kyocera/wx310k|lenovo|lg|lg/u990|lge\ vx|midp|midp\-2\.0|mmef20|mmp|mobilephone|mot\-v|motorola|netfront|newgen|newt|nintendo\ ds|nintendo\ wii|nitro|nokia|novarra|o2|openweb|opera\ mobi|opera\.mobi|palm|panasonic|pantech|pdxgw|pg|philips|phone|playstation\ portable|portalmmm|ppc|proxinet|psp|pt|qtek|sagem|samsung|sanyo|sch|sec|sendo|sgh|sharp|sharp\-tq\-gx10|small|smartphone|softbank|sonyericsson|sph|symbian|symbian\ os|symbianos|toshiba|treo|ts21i\-10|up\.browser|up\.link|uts|vertu|vodafone|wap|willcome|windows\ ce|windows\.ce|winwap|xda|zte) [NC]
RewriteRule .* - [E=W3TC_UA:_low]
RewriteCond %{HTTP_USER_AGENT} (acer\ s100|android|archos5|blackberry9500|blackberry9530|blackberry9550|cupcake|docomo\ ht\-03a|dream|htc\ hero|htc\ magic|htc_dream|htc_magic|incognito|ipad|iphone|ipod|lg\-gw620|liquid\ build|maemo|mot\-mb200|mot\-mb300|nexus\ one|opera\ mini|samsung\-s8000|series60.*webkit|series60/5\.0|sonyericssone10|sonyericssonu20|sonyericssonx10|t\-mobile\ mytouch\ 3g|t\-mobile\ opal|tattoo|webmate|webos) [NC]
RewriteRule .* - [E=W3TC_UA:_high]
RewriteCond %{HTTPS} =on
RewriteRule .* - [E=W3TC_SSL:_ssl]
RewriteCond %{SERVER_PORT} =443
RewriteRule .* - [E=W3TC_SSL:_ssl]
RewriteCond %{HTTP:Accept-Encoding} gzip
RewriteRule .* - [E=W3TC_ENC:.gzip]
RewriteCond %{REQUEST_METHOD} !=POST
RewriteCond %{QUERY_STRING} =""
RewriteCond %{REQUEST_URI} \/$
RewriteCond %{REQUEST_URI} !(\/wp-admin\/|\/xmlrpc.php|\/wp-(app|cron|login|register|mail)\.php|wp-.*\.php|index\.php) [NC,OR]
RewriteCond %{REQUEST_URI} (wp-comments-popup\.php|wp-links-opml\.php|wp-locations\.php) [NC]
RewriteCond %{HTTP_COOKIE} !(comment_author|wp-postpass|wordpress_\[a-f0-9\]\+|wordpress_logged_in) [NC]
RewriteCond "/home/blogpub/public_html/wp-content/w3tc-%{ENV:W3TC_DOMAIN}/pgcache/$1/_index%{ENV:W3TC_UA}%{ENV:W3TC_SSL}.html%{ENV:W3TC_ENC}" -f
RewriteRule (.*) "/wp-content/w3tc-%{ENV:W3TC_DOMAIN}/pgcache/$1/_index%{ENV:W3TC_UA}%{ENV:W3TC_SSL}.html%{ENV:W3TC_ENC}" [L]
</IfModule>
# END W3TC Page Cache
# WPMU default starts:
#uploaded files
RewriteRule ^(.*/)?files/$ index.php [L]
RewriteCond %{REQUEST_URI} !.*wp-content/plugins.*
RewriteRule ^(.*/)?files/(.*) wp-content/blogs.php?file=$2 [L]
# add a trailing slash to /wp-admin
RewriteCond %{REQUEST_URI} ^.*/wp-admin$
RewriteRule ^(.+)$ $1/ [R=301,L]
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule . - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-.*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]
<IfModule mod_security.c>
<Files async-upload.php>
SecFilterEngine Off
SecFilterScanPOST Off
</Files>
</IfModule>
At the top there are some rr to handle some redirections.
However the message in the dashboard remains ("Enhanced mode page cache is not operational. ..."). Below, Page Cache is ON, Page Cache Method is set to "Disk (enanched)". Individual /wp-content/w3tc-BLOGNAME.EXT/pgcache/ folders are empty, only an .htaccess inside them, this let me think it's not working as it should, maybe.
Forgot to mention, in "Compatibily check" I got those errors, maybe they are responsible for this:
PHP Timezone: Not set
Opcode cache: Not installed
Memcache extension: Not installed