mgsimon

Pretty Permalinks requires outofthebox the module mod_rewrite. This module is a workaround to use pretty permalinks without any rewrite rule. The errorhandling – customized errorpage – will be used to resolve pretty permalinks. mg404Rewrite-Modul sends HTTP-Header-Code depending on the request. 
If you have any posts to permalinks, you can try to activate PostProxy to resolve this issue (configurations / misc).
<h3>Licence</h3>
GPL (http://www.gnu.org/copyleft/gpl.html)

mg404Rewrite

This module is a workaround to use pretty permalinks without any rewrite rule.

Kailey (trepmal)

Shaun Scovil

It was brought to my attention shortly after releasing this plugin that WordPress automatically flushes 
rewrite rules when you visit WP-Admin > Settings > Permalinks. Ingenious, right? So don’t bother installing it, 
but feel free to check out the code if you are looking for an example of how to:
<ol>
<li>Use the WordPress Settings API to add an option to an existing Settings page;</li>
<li>Use the WordPress AJAX API in conjunction with your plugin options;</li>
<li>Over-engineer a solution to a problem that has already been solved.</li>
</ol>
Enjoy! 🙂

Rewrite Flush Button

Adds a "Flush Rewrite Rules" button to WP-Admin > Settings > Permalinks.

mg404Rewrite vs Rewrite Flush Button