INITIALDELAY=10 just worked good, 3 was to less. I think 4s could be good for me.
..and one more thing: if use command ./build-initrd.sh /boot/initrd.conf, it is not necessary to change INITIALDELAY option in build-initrd.sh (only initrd.conf makes sense then). Probably initrd.conf is not really necessary, because it doesn't changed delay w/o remaking initrd.gz.
Jan
