Thanks SirDice, media_automount works.
Now only thing remaining to figure out is how with media_automount set to false (unchecked) anyway automount only usb-sticks and CDs as inserted.
By other words how to automount only usb-sticks and CDs without automounting HDD partitions?
PS. Yes, config depends on a distro: Ubuntu, Sabayon and Suse don't automount but allow mounting with 1 click, Mandriva mounts anyway whatever is done with gconf.
Note. Personally I have no problems with cli and thus manual mounting. I'm just trying to get things working as they supposed to. The more people use FreeBSD the greater opportunities for its developers and all of us.