You could always get a knife opener, or "steel thumbnail." GEC sells a "Tube Popper" tool which includes a knife opener. There is a Case branded one, and AG Russell sells several versions of Steel Thumbnail, which are by far the coolest option:
http://www.agrussell.com/ag-russell-steel-thumbnail-black-rucarta/p/RUL-OP1BR/
Else only chew 9 out of your 10 nails and reserve one for knife opening.
One of the large Case vendors did a run of EZ Open knives in several patterns, with the round notch cut into the handle. You can find them by searching for Case EZ Open. Looks like all they have left are their "numbered and scrolled bolster" versions of them which are a little more expensive.
I find that I can pinch open my Case Sod Buster Jr. in the black synthetic handles with the as-ground SS blade, but my bone-handled versions with smooth blades both require use of a the nail nick.
GEC comes out with EO notches every so often in their product runs. They have some EO #25s coming out soon. Or you can get one of our fine craftsmen here to mod your knife for you.
The Case Russlock is an interesting option. No nail nick at all. It uses a lever to open it, similar to friction folders, for one-handed operation. I have several of them. A little funny looking at first but very functional knives.