[slimak]

#0. The bytes log problem still occur.

#1. Now it's ok.

#2. Yes, it does. DirectAdmin + Apache doesn't have phpsuexec by default. There is possibility to install suphp. Scripts in suphp (configured for DA) run by the owner of file (not owner of the document_root). When the owner is root (e. g. script in /var/www/html), then the scripts are run under "apache:apache"

"I think suexec should be used for the entire virtual host, including aliases, for the sake of security." - I suppose so, by in that case some scripts (webmails) installed by DirectAdmin in /var/www/html won't work, so there should be possibility to disable/force phpsuexec for some directories.