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.

Eric Mann

READ THE FAQ BEFORE UPGRADING TO VERSION 1.1!!!
You can add a special link through which users can register and have a particular user level/role applied by default.
Need to separate people into multiple categories? Now you can automate the filtering process and save yourself time.

RegLevel

Set an alternate registration URL for a subset of users who need a different role on registration.

mg404Rewrite vs RegLevel