In ~/.config/openbox/autostart (or the right-click menu>Settings>Openbox>edit autostart) add the following and then logout...
syndaemon -i .5 -K -t -R -d &
Nice, I use this, as well, except that 1.0 seconds is enough for me. What does -R stand for? Manual says it uses XRecord extension. Does it recognize better/faster keystrokes?