I came across http://usvn.info/ recently and if looks like it may provide a nice interface for the Subversion contrib.
Does anyone have any experience with USVN?
Thanks,
Kevin
USVN requires PHP5 which is not installed on SME Server 7.x, PHP5 will be supported in the next major release of SME Server.
If you like different access per subfolder you will need to do heavy modifying on the templates manually, you can not do this through the server-manager panel as it is unaware of the contents of the repository.
Besides from judging the documentation briefly it seems that you can not connect the SME Server backend easily, which will not enable you to use the groups and users already defined on your SME Server, which the contrib does.
Are you sure you could not split your subfolders over multiple repositories so you can granulate the access over them again?