It's rather baffling that you appear to believe that the police dealing with RTA offences is a waste of resources, yet would happily reallocate those limited resources to patrolling on foot everywhere (or "driving at walking speed"
). It's an old-fashioned concept, and as much as there's a need and a desire for the police to be present and involved in the community, it's not the best use of a police officer's time which is why PCSOs were introduced.
If you want more officers available to deal with lower-level crime, do something about how those lower-level/persistent offenders are dealt with, and do something about how much time they're tied up dealing with people with mental health issues and then waiting at hospital for an equally-overstretched mental health time to assess those people. You'd free up significant time and resources by dealing with those two issues, but unfortunately there's no quick fix for that.

If you want more officers available to deal with lower-level crime, do something about how those lower-level/persistent offenders are dealt with, and do something about how much time they're tied up dealing with people with mental health issues and then waiting at hospital for an equally-overstretched mental health time to assess those people. You'd free up significant time and resources by dealing with those two issues, but unfortunately there's no quick fix for that.