Dannielle, have you considered writing a letter to the county and newspapers? I've been hearing about this too, and it drives me wild that no one is talking about lowering the speed limit. They're only arguing about whether or not to ban bikes.
In addition to not solving the problem (which is the speed limit), banning bikes sets a horrible precedent for the rest of the nation. It's probably because of Black Hawk, Colorado that it's gotten as far as it has in St. Charles, Missouri.
One good thing has come out of this: a clear statement from the state bike/ped/ADA coordinator, Melissa Anderson, who has been ambiguous in the past about her and MoDOT's* support for cyclists. The roads in question aren't county roads. In Missouri, the state owns most of the roads (the type that are owned by counties in other states). So the state determines the speed limit and what vehicles are allowed. Anderson issued a statement that only MoDOT can ban bikes on those roads and that MoDOT has no intention of doing so.
*MoDOT has NOT been ambiguous, but until recently clearly in the anti-bike camp. This has all changed since MoDOT director Pete Rahn left, which is perhaps why Anderson is being more direct.
2009 Trek 7.2FX WSD, brooks Champion Flyer S, commuter bike