Wordpress has a bug, that direct plugin upgrade (upgrading plugins directly into filesystem if it's writable, not via ftp) is not working if wp-admin/update.php is not writable by wordpress (see http://core.trac.wordpress.org/ticket/10205). Since the bug is open for more than 4 years and upstream is not willing to fix that bug it would be nice to have a fix in gentoo, which would be webapp_serverowned "${MY_HTDOCSDIR}"/wp-admin/update.php in src_install. It exposes a security risc, since it allows the httpd to change code it executes, so a USE-flag may be an apropriate solution, on the other hand theres already webapp_serverowned "${MY_HTDOCSDIR}"/index.php webapp_serverowned "${MY_HTDOCSDIR}"/wp-admin/menu.php in src_install() exposing the same risc (which may be a bug as well).
