Renaming devices in pavucontrol is totally un-discoverable

Currently you not only have to know that you have to edit ~/.config/pulse/default.pa to add this:

.include /etc/pulse/default.pa
load-module module-device-manager

...but once that's done, pavucontrol gives no helpful indication of where/how you renaming devices. You have to "guess" that you have to right-click on the combobox widget in front of "Port:" in the corresponding input (or output) devices tabs.

Instead, the UI should simply replace the device name's GtkLabel by a GtkEntry where you can directly edit the name, and boom you're done. You could even use the placeholder-text property to display the default name when the user deletes all the text, that way it's clear what is and isn't at the default value.