I've seen someone on GS use Dzus (quarter turn) fasteners like these:
I intended to use them on my car, but I couldn't get them locally, and I didn't want to order them online without seeing them first.
While the tool-less thing sounds like a great idea when you're in the planning stages, it's not that big of a deal when they're on the car. I just bought an extra hex key of the correct size, threw it in the glove box and forgot about it.
Plus, with some kind of tool required, it's that much harder for someone to mess with it.