I've been looking around for split testing solutions for wordpress and most answers point to the now-outdated shrimptest plugin. I'm not really interested in using a plugin anyway, unless I write it myself.
I'd like to be able to pass a parameter to a multipage post and have the content re-arrange itself; prev / next buttons moved up, image moved down, font-style changed, etc.
Unfortunately I'm just not seeing much info available. Is it possible to swap one version of single.php for another, based on the URL param? Are there any best practice guidelines for split testing?