I see where you're going George, but some of these systems like the TAS and K-Line cruise stuff, are not even Lionel equipment. As far as the ERR stuff, I think they've pretty much stated that R100 mode is the right choice for the 100 step mode. Personally, I use R100 for TAS EOB and K-Line cruise. I set the K-Line for 128 step mode.
One thing that is misleading in Norm's comment. The big red knob sends absolute TMCC or Legacy steps if you're in either Legacy or TMCC mode for that locomotive. The RR speed step control is only available in Legacy mode.