Crash jibe buffer
I help deliver a 50' boat a couple weekends ago. We sailed all night on a run wing on wing. Wind was about 15 knots. Under those conditions I would usually rig a dock line from the boom to the rail as a preventer as it is really hard to see the sails in the dark.
There are some disadvantages having a preventor that can't be released easily too but still it seems the lessor to two evils if you don't have a real boom brake.
All he did was leave the traveler uncleated on both sides. When we did inevitably jibe the traveler pulling it's line through the blocks has a pretty good damping effect.
I'm not saying I would do it myself except in very light air but it did seem to work. The rig stayed up.