Black Widow makes two limb bolts that don't require allen wrenches: a brass thumb limb bolt and an antler burr limb bolt. You can see these on their web site under bow accessories. I had the brass thumb limb bolt for one of my Widows, and tried it to see if it would work on my Shawnee. It won't work, since it is designed to fit the Widow. However, it looks like either one could be modified to fit the Shawnee, either by working the brass one on a lathe or by using a brass sleeve under the antler burr one to take up the recessed hole in the Shawnee Riser.
FWIW, I don't use the brass limb bolt on my Widow anymore, since I decided it looks better without it.