2 - mounts might take time, need to be executed asynchronously in a forked process?
4 - need gc for active jobs that nothing cares for
6 - need gc for units that are not referenced anymore
8 - refreshing of units (i.e. reload config files)
18 - hookup with battery status, suspend/resume
20 - add a job mode which shuts everything down but what is requested
22 - write log subsystem/log output logic for daemons
24 - implement priv dropping
26 - allow to disable priv dropping for hook scripts from fragment
30 - implement mount/automount
32 - more process attributes: chroot, cpu affinity, scheduling
34 - create session/pgroup for child processes
38 - templating/instances
40 - verify fragment data after loading: refuse cycles on yourself, service units contradicting, more than one Start executable, ...
44 - automatically delete stale unix sockets