svn/apache path-based per-user access gui

[Volker Kuhlmann]

My company is looking at setting up subversion/apache as version control
system. However, path-based per-user access restrictions are needed, and
being only capable of ThatOS(TM), they can't edit a simple configuration
file and all die unless they have a "click-me" in front of them. As
someone is selling some GUI for this, doze-only of course (everyone else
doesn't need it), they want to run the whole version control on
ThatOS(TM). Does anyone know of, and preferably has some experience
with, a Linux-based GUI that is able to configure SVN-path-based users
and what parts they're allowed to access?

Thanks muchly,

Volker