Originally Posted by BigFurry

Okay, that's pretty good, I might start using it, thanks!

It's not entirely my use-case though, correct me if I'm wrong. I also want to pass an ID that's unique for every single one of my visitors.
I don't think it's a good idea to create a hundreds of thousands of tags, or can NATS handle that?

I guess this is the matching documentation: Automatic Campaigns - TMMwiki

So instead of the current
?autocamp=campaign,traffic,tags
I'd like
?autocamp=campaign,traffic,tags,id :-)

Unlike campaign/traffic/tags, I wouldn't want to break down, or sort by this 'id', only see it when I view the details of a join.