Add-on Advanced url options

[Alpha1]

Currently Xenforo has only 2 URL setting:

1. a specific version of friendly url's
2. a version of friendly urls that lists 'threads' and omits thread titles.
3. with 1.2 it will be possible to change routes. i.e. rename a specific part of the url.

But often its not possible to change urls in such away that you can keep your old urls.

For example:
My websites have their forums in the /forum/ directory. With xenforo friendly urls this will automatically become:
/forum/forums/threads/threadtitle.1
while I need it to have:
/forum/threadtitle.1
or
/forum/forumtitle/threadtitle.1

What is needed is basically the functionality to omit or include elements into the url structure.

Browsing through the questions forums shows that this is something more people need.
A request also often encountered in the suggestion forums is top have a simple profile url:
domain.com/username

or having short alias urls:
domain.com/11s1s

An addon that would provide all these settings would be very welcome.