+* transient units: allow creating auxiliary units with the same call
+
+* make BlockIODeviceWeight=, BlockIODeviceBandwidth= runtime settable
+
+* split up BlockIOWeight= and BlockIODeviceWeight=
+
+* how to reset dynamically changed attributes sanely?
+
+* when reloading configuration, apply new cgroup configuration
+
+* implement system-wide DefaultCPUAccounting=1 switch (and similar for blockio, memory?)