My suggestions

[Adrenaline]

1-Add /topstats something like /topspree
2-Enable /park command for players who have vehicles only in places like these
Screenshot by R3LOAD_ http://imgur.com/a/09Avh
3-Accept suggestions 1 and 2 xD

[Human.]

1. Denied, we already have /topkiller & /topratio
2. Denied, we had /park cmd, but it was abused( player park at fight places, building's entrance..etc )
3. I have to deny it.