One or more of the OakPark Jigs had a 45 deg fence that was held and aligned with pins that mated with the surface the mated with. If I recall correctly that even include holes in the route mounting plate. I've seen it used on the Router Workshop, but that has been a while ago.
Don't believe it is a starting pin that the OP is talking about. As most of the Oak Park jigs are no longer available, finding a used one is probably the only option short of making your own. As someone mentioned, not many Oak Park jig owners are parting with the tools, so not many options!
I have found that hand tools are the best choice when I want to make mistakes at a slower rate of speed.
I don't suffer from insanity. I enjoy every minute of it.