g1smd - 9:29 pm on Oct 22, 2013 (gmt 0)
Although you can redirect folder URLs to index page URLs or index page URLs to folder URLs, the latter is what you should be doing. The former can create one whole big mess that you really want to avoid. Yes, you'll need to also adjust internal links to agree with that, but the end result will be much easier to maintain.
You sure do not want to be redirecting requests for example.com/ to example.com/index.php or for any such similar requests at lower levels.