Suggestion

This is a rather solid one as it will help prevent trolling.
Add support for https://umod.org/plugins/playtime-tracker
This will prevent things like day trippers from voting for the same map or placing votes to equal out the polls.
Only players with X amount of time on the server will be allowed to vote for the next map.
Obviously this would only be an option and not a requirement in the config.
But I think it's one that a fair amount of server owners/admins would use.