Translation of the 'StoryBoard.Init' section of 1.X scenarios to 2.0

In scenarios originating from OSC1.x the INIT section of 1.X is often translated to OSC2.0 as an own phase as part of a serial. But as this phase should only set the initial values it should consume no time (i.e. having duration 0).

The question is: Is it allowed at all to define phases with 0 duration in OSC2.0? Please note that in this scenario this is not necessary because the INIT phase can be merged with the succeeding ones and this might apply to many if not all scenarios originating from 1.X. Nevertheless, this question occurred and should be discussed.