I understand about rendering dynamic pages. I think we had this same discussion on the CSS Sculptor beta. I dont mind if the php isnt parsed, and php tags show in the output. It would just be nice to be able to browse to the page using the folder icon instead of typing in the full http URL.
All you would really have to do is remove the filetype validation, perhaps if people choose the *.* flietype from the menu. I was able to choose one of my php files, but then got a popup error that it wasnt an html page.