It would be nice to allow users to only download a specific directory within a hack's subversion repository.
The graphviz plugin subversion tree has been expanded to include tags and branches. These are being used to track the releases as well as allow for development to continue in branches while the current release is made available in the 0.9 directory. In essence, the 0.9 directory is treated as the trunk for the latest release version that works on Trac 0.9. When Trac 1.0 is released, a second trunk will be created called 1.0 that will allow for support of the plugin on Trac 1.0.
The current download mechanism creates a .zip of the entire graphviz subversion tree: tags, branches and release trunks. It would be nice to be able to allow users to only download a specific directory, like 0.9.