I read that the ones Orlando
Stroller Rentals uses (Citi Mini) has wheels that just pop off with a click so you can pop one of the wheels off when you park it - who would want to mess around with steeling a stroller that doesn't have a wheel?
Also love the idea of posting a huge sign on there. We'll be renting one but I'm thinking of having a DISIGNER create something and then laminate it and hang it on the stroller using cable ties. (So it's not easy to yank off) And I like the luggage tag idea as well. I think people who do take other's strollers PROBABLY take the ones that are easy to take and not easily identified by their owners.
Still, it sucks to have to even THINK about this when at a place as happy as Disney World!