How do I pass my password to gksu?

gksu doesn't has an option like sudo has to pass the password to it in the following way:

echo 'password' | sudo -S command

Anyway I wonder which is the simplest way to pass my password to gksu. What I found until now is:

parallel -j 2 -- "gksu command" "( sleep 1; xdotool type 'password';  xdotool key 'Return' )"

But this doesn't look so good for me (parallel and xdotool must to be installed, there is some time spent until the password is passed, the window which asking password is not avoided). So, is there a better way? --- Note: I'm not interested to edit the sudoers file or in explanations like "*don't do this, it's not safety!*".