SIGF, i took you to be one of Dave's evil interleaving cohorts.
I should explain i am an engineer, so any coding i might have done would be either for my own freetime projects or to solve a specific design problem. I don't get paid for code.
The coaxial, exampled by the KA-32, is probably the exception to my statements above. Even so this only really works if the main rotor was to have more than 6 blades - this way there is no mass compromise. Intermesher comes a close second, and in fact there may be aerodynamic advantages. So far there have only been small intermeshers, with few blades, so there is probably no mass advantage.
What i was assuming was that the justification for side-by-side or interleaver was for roll control, and symetry of cyclic inputs. Hopefully my control arguements will make sense in this context.
Anyway, back to the grind...