I shortly saw another folding bike (STRIDA type) with a nice feature in the train. Did you find your bicycle starting to roll without you wheeling or pedalling, possibly in a train? Then this is the solution for you.
Fix an elastic band to a handlebar plug or thread it through the slot of a bar end. Two minutes and you won’t see your bicycle running away. I periodically use this band when I only fold the rear wheel.
Cheers,
denlinne