Adding a campaign to a folder? Or, alternatively, unique HTML content per recipient?

1. Is it possible to add a campaign to a folder via the API? I don't see it documented, but I may have missed it.

2. The situation is that I want much more dynamic logic in the emails than simply using custom fields would allow, so I'm considering building the HTML from an external script and creating a campaign for each individual email. That would seriously clutter up the campaign list if they can't be sorted into a folder. It'd be pretty crappy for analytics too.

As an alternative, is there some way of basically swapping out the entire HTML content of a campaign for each contact it sends to? That way I could reuse a few campaigns but have infinitely dynamic content.