I've been using a preventer where I rig a block on a wire pennant to a forward cleat, run a line from the end of the boom to the block and then back to a winch. That keeps the main pulled forward and unable to accidentally jibe, then sometimes I run a line from the aft of the boom to an aft cleat to completely stabilize the boom/main (light and or puffy winds).
SD, is the dutchman better than that? I ask you 'cus you know my boat well enough to answer, and have a dutchman. I rigged my own because I wanted prevent, not brake - but it's a real hassle when I do want to jibe (have to re-rig it all over again).