I run a 3.5.1 multisite install. Only superadmin was not filtered by kses. So the admins on my sub-blogs couldn't post php code or java script. So, to change that I would have to alter the user role "adminstrator", right? Turns out, that adding capability "unfiltered_html" doesn't work. Either I'd have to use a role scaper plugin or elevate the user. That seemed a bit much for this plugin only.
So I changed the plugin line 113
if ( current_user_can('unfiltered_html') )
if ( current_user_can('administrator') )
and now my sub-blog admins can post as well. Maybe this helps someone. Greets Markus