+1 on Halowheel "slow-release" skewers.
I use these on my Raven, as well as on my derailleur bike (not a Thorn). I started using the Halowheels in 2015, when I found that the rear QR skewer on my Raven was working itself loose. I had stopped for lunch on a very rural road in the Ottawa Valley, and wheeling the bike around, I felt a slight movement from the back wheel where there should not have been one. The QR had worked loose, and fortunately I noticed this & tightened it bef descending some steep bumpy hills (!) When I got home, I ordered a couple of pairs of Halowheel hex-key skewers from SJSC.
They've been trouble-free, but I have noticed that the little tabs, which help to centre the skewer before tightening, both have bent on the rear-wheel skewers. (I tighten these to the recommended 7 Nm.)