+* add a concept of RemainAfterExit= to scope units
+
+* add journal vacuum by max number of files
+
+* add a new command "systemctl revert" or so, that removes all dropin
+ snippets in /run and /etc, and all unit files with counterparts in
+ /usr, and thus undoes what "systemctl set-property" and "systemctl
+ edit" create. Maybe even add "systemctl revert -a" to do this for
+ all units.
+