Nice work! As much as I love my flics, this is actually one of the things that annoys me too. It's to easy to accidentally trigger the them when wearing them on clothes or keeping them in pockets. In the future I would love to see a "rugged" version of flic for sports / heavy duty work scenarios: a little bit bigger and sturdier, water proof, more robust battery lid that won't come off too easily, bevel like this around the "press area" to avoid accidental triggering (but you should still be able to press it with work gloves on), ability to lock it or turn it off and a much much stronger belt clip.
Until that happens, I wish I had a 3D-printer so I could print a few of these. :-) How easily does the back cover come off? Is it strong enough to put some double sided tape on it and stick it to something like a belt clip?