I also have the Gorillapod (SLR version) which I was also using for speedlite placement (along with FRIO http://www.amazon.com/gp/product/B004CBTCFC/ref=wms_ohs_product?ie=UTF8&psc=1),
I infer that you don't have the Joby ballhead for the SLR Zoom. I use my SLR Zoom for Speedlite placement, too. I have the Joby BH-1 ballhead on it, and they make a little cold shoe flash clip for it (which I ran across on a clearance table at a camera store).
Thanks. I didn't know about that. And no, I don't have the Joby ballhead. The flash foot - seems like a flat out cold shoe foot with a screw hole in the base - at the time I was using YN603 triggers though, and they didn't have a locking mechanism on the bottom foot, so I got the FRIOs as they have a clip lock built in (you push it down to release and slide the flash/trigger off). I'm using mainly YN622s now though, so don't need that functionality anymore.
Thanks for putting the BH-1 back on my radar though. Seems perfect for the M.