Hi there..Yes.. The GUNTING can have a sharpened secondary edge and yes it would be totally safe to the user for it would be INSIDE the handle! and..Yup, one of my original protos of long ago was very very sharp on the secondary edge..I was originally thinking for example that upon downward Kin-Op ( Kinetic Opening) that one immediately went into a upward Florette motion,( or a back cut) bringing the sharpened back clip edge into action so you cut upon "retreat" and were in position to them thrust or slice back into the BG...
of course I was thinking STRICKLY in Filipino terms...of cutting that is, not practicallity..
"How could I apply Filipino cutting actions and cut every way I entered into the opponent's space...ahhh a sharpened secondary edge of course!"
There are drawbacks of course...With the sharpened back clip area, one cannot execute grabbing in reverse grip without cutting someone..
checking, hooking or locking with the blade become cutting with the blade...
disengagements with the blade becomes SLICING with the blade..
Kin-Op's could become Kin-Cuts..that every time you Kinetically open the knife it doesn't just open it CUTS...
so I, we'd lose out on some very cool easy control moves..
With ANY portion sharpened..yup ANY portion, in some of our States thats a double edge knife, dagger dirk type of thing..its not allowed in most municipalities..
Its shade of grey and ATTY domain in many others..( not a good bet!)
So to prevent that I made sure that the back edge is totaly FLAT.no pretense or intent of ANY TYPE of real or false edge..its a single edge tool...
I'd check with SPYDERCO for "advice" as to the best way to sharpen the secondary edge..I certainly wouldn't do it myself ...
Then get a custom maker or knife maker to put an edge on it IF you want..
Again I don't recommend it.. I 'd watch out for the laws and where you carry it..
BUT you're thinking as I did when I first came up with the idea!!!!!
RIGHT ON!