I followed a suggestion made in the comment section of one of my recent Surly Big Dummy posts and installed a hose clamp on the front QR of my Dummy. Because the OMM rack [which I love] requires a really long skewer up front I couldn’t use the Pinhead locking skewer I had [it will probably find a home on the front wheel of my Surly 1x1]. Rather than get a hold of a Pinhead rear wheel locking skewer coded to the same key I already have I figured this was a reasonable alternative. Although it can be opened it takes a lot more time/hassle than a QR and since the OMM rack requires the whole skewer be removed to take off the front wheel I think this is enough theft deterrence given the low cost of the wheel.
If you are looking for a bit more security for your wheels and don’t need a fort knox level setup this may be the best $3.00 that you spend.