Lets go through this step by step, each with me asking some questions as answers are given until we find ourselves somewhere.
How do you suspect having another mod will fix the chat spam issue?
Because If I were mod I would actually fucking get rid of this spam
How would you do it?
With my mod powers
So you'd what, delete what they're saying one by one?
First, I would go in the chat. I'd see the chat. Then I would say "is this spam bothering you guys?" If they say yes, I would give them a time out, the spammer I mean, and each time they would get a longer time out.
With what, the ban function?
People who are silenced like that just switch accounts, what's your plan for that?
Eventually I would ask users to vote on a poll if the spammer should be banned from chat or not
They'll just change accounts, and having a poll makes it into a popularity contest. You will inevitably see reasonable people put into the crossfire.
Following that, how long would you have the poll be up for debate?
(I would not count puppets, like luna ect) and then, I would ban that user if it was voted upon. If the user made puppets to keep spamming, I would eventually go to ban the IP if it was voted on with another poll.
Okay, then they log in with a VPN or reset their IP through their router, or as we've seen some have even used public wifi connections.
Now what?
Ę̵̚x̸͎̾i̴͚̽s̵̻͐t̷͐ͅe̷̯͠n̴̤̚t̵̻̅i̵͉̿a̴̮͊l̵͍̂ ̴̹̕D̵̤̀e̸͓͂t̵̢͂e̴͕̓c̸̗̄t̴̗̿ï̶̪v̷̲̍é̵͔