How to have separate flowSimulate Time Scale?

I have 2 flow presets in the scene. However I noticed that all emitters are using the same Time Scale from one flowSimulate settings even though I’ve set them to use different layers. Is it possible to have separate flowSimulate Time Scale values for different flow presets?

Unfortunately today time stepping is done in lockstep for all layers. So currently the minimum time scale across all layers is used to control time stepping.
We should be able to fix this particular issue without too much complexity. The other timing settings like variable time step and steps per second would be much more involved.