FlightPathOBN,
in fact it is just as simple as that. The equation describes the acceleration (a) of an object with velocity v following a curved path with radii r in all and any conditions.
If said object is in an accelerated reference frame, such as in a gravitational field, obviously you have to account for that as well - but the equation above is all there is to it as far as acceleration due to manoeuvring goes.
I'm certain none of this is news to the OP though.
Stick with SI units and you take a lot of additional complexity out of it. 9.81 meters per second square will be just fine, even if it does vary a bit with latitude (and location). For FS work, anything between 9.5 and 10 would do I'd say - no need to confuscate matters.
Bank angle is just a means of achieving the acceleration required, but that's merely one application of the theory.
Cheers,
Fred