User account control
I installed Portmaster on a workstation and I was very happy with the program. Then I signed in with another low privileged account and in my surprise I could see/access/edit firewall configuration. I couldn't find a builtin way to restrict a low level user from seeing/editing my rules.
I could stop the front-end from running for low level users and restrict them from manually running it but if both the admin and the user have a session at the same time, the front-end would launch and it would be accessible to them. I have to setup 10 hacky configurations to restrict low privileged users from accessing the front-end which may break in the next update.
Therefore, I believe a good User Access Control implementation restricted to Administrators by default would be very useful/beneficial.
Source: safing/portmaster