Is there actually any benefit for listing a RB at RB?
Since SP is directly tied to weight, and the 20 pound weight differential between WR and RB equals 2.5-3 SP, it makes sense to list all RBs at WR for SP purposes.
Then there is this per JDB (in some other thread): "Strength in and of itself is not relative to weight, but most places that strength is used as an input weight differential is used as well."
The only time I know for sure that RBs use ST is when they are pushing the pile. Does the 20 pound weight differential make a difference there?
Then there is the issue of Break Tackle. Break Tackle is tied to SP and not ST, so it's better to play that Break Tackle RB at WR so that you can get him faster and improve his Break Tackle more.
In the next version of this, I'm going to look at playing all OL at RT.