Unique way to ban a user

[wimiadmin]

So my inbox was getting pounded with emails from folks inquiring about other banning methods aside from IP addresses.

You really have to think about what you're wanting to do and drill down on that specific topic. Once you break it down, you'll have the answers. Think about how a user connects to your website/forum/etc. and what parameters are in that connection. Then think about what can be specific in that connection.