+* service_coldplug() appears to reinstall the wrong stop timeout watch?
+
+* transient units: allow creating auxiliary units with the same call
+
+* make BlockIODeviceWeight=, BlockIODeviceBandwidth= runtime settable
+
+* split up BlockIOWeight= and BlockIODeviceWeight=
+
+* introduce high-level settings for RT budget, swapiness
+
+* how to reset dynamically changed attributes sanely?
+