I've thought about it a few times, but the design doesn't really lend itself to modular landing gear.
Lopping the legs off and clamping something new to the arms is about all I've come up with so far.
A very low tech and cheap solution that holds up well and costs next to nothing is PVC gutter downspout.
Get yourself a 10' length of downspout for maybe $10 and you can make enough for yourself and everyone who has ever made a quadcopter! Just cut off a 1/2" piece and drill a hole as shown in the picture. I used a chop saw to cut my pieces from a scrap piece of downspout I had just lying around. See photos.
No doubt...that's a great idea. Seems like a perfect material.
Fortunately, I haven't snapped any of the stock legs off yet, but this is top of the list.
There is always this type of gear also - two different heights a gopro mount and battery tray - www.x468.com
I am currently using this style and is easy on off - They should have future camera mounts that work with it as well.