STASH-2481 (Branch Permissions) were implemented I've been extremely happy with the ability to finely tune permissions for branches.
However, this quickly became very time consuming which brings me to...
I would love the ability to setup Branch Permissions, but at the Project level. These would be applied automatically to all child repositories. It would only allow Apache Ant patterns as described here.
This would allow quick changes to be made without consuming too much time. This is useful when you follow a specific workflow\permission scheme across your entire project and don't want to waste time applying it to each and every repository. In my actual user case, I had to apply the exact same Branch Permissions 6 times to 18 different repositories (total 108) for a single project.