So I was at Grainger today because I needed some safety glasses, and I saw their Mag-Lite display. I finally picked up one of Mag-Lite's AA Mini-Mag accessory kits; the one with the lenses and (more importantly) the pocket clip. I thought I'd try it on my Fenix E12, and if it didn't fit, it'll go on my Mini-Mag.
The clip is a slight stretch to fit on the E12, but it's on there nice and snug. You'd almost think it was designed for this light. And WHAT an improvement it makes in the handling of the E12. Now I can instantly tell which end is which, no more "clicking" the lens. It also won't roll now. And of course it carries much better in a pocket.
Any E12 owners might consider picking up the Mag-Lite kit for their E12. It really does help.
Also, bonus points to Grainger for having a discount for students at my college. That's really cool.