In the announcement of OpenModelica 1.12 I found:

New methods for inline integration for continuous equations in clocked partitions, now covering: ExplicitEuler, ImplicitEuler, SemiImplicitEuler and ImplicitTrapezoid

I also found a compiler flag:
inlineSolver

From Dymola I know that one can choose a real time solver on the corresponding tab of the simulation settings.

In OMEdit I tried to add the following text to the translation flags edit field:

+inlineSolver

and have chosen the ImpEuler as a solver.
This didn't make any difference in the simulation.

Do I have to define a clocked system with Synchronous to make use of the mentioned inline integration features?