you can open all clams with an in-game macro, but u need to update this macro to work w/ 2.0 (it might already work, try it)
Code:
/script l=5;m=0;f=string.find;for b=0,4,1 do for s=1,GetContainerNumSlots(b),1 do n=GetContainerItemLink(b,s);if n and f(n,"Clam")then if f(n,"Clam ")or f(n,"Clams")then b=b else l=b;m=s;end;end;end;end;if l<5>0 then UseContainerItem(l,m)end
src: