If you use .htaccess to redirect visitors such as site.com/this.php to site.com/this/ you'll have all kinds of fun trying to make Pagelime play ball and find your files — Pagelime needs the .PHP or .HTML extensions to work properly.
A while back, I was trying out .htaccess rules and this was working great. There's no way to redirect "file.php" to "file/" as Pagelime will freak out — but it's a solid workable solution for now.
There was still the annoying problem of your site nav not working as it should inside Pagelime, as all links are pointing to the extension-less URL. You could tell your clients to only use the Pagelime pull-out nav, but theres a much better way ...
You can use this PHP code snippet to give two versions of your nav, one for regular users and one for Pagelime!
I'm by no means a PHP expert, so if there's a more graceful way of doing this I'm all ears — but it's a pretty handy snippet for your websites, and will save your clients a lot of confusion.
Rob