Allow users to compare Walkability Checklist results (real) to WalkScore potential.
When the Walk Score is calculated, provide an online "real-world' Walkability Checklist for users to calculate their own score. Provide such questions as "Is this route networked with sidewalks, greenways, or walking trails?" The negative responses should subtract from the WalkScore. This allows folks in suburbs or rural regions to compare their walkability potential to their real situation.
Vote on Walk Score improvements
WalkScore just launched WalkScore.org — a new website where you can vote on Walk Score improvements. They're also releasing open source code for Walk Score on this site.