Controlling physics tick on Unity ECS Physics - re-question

So I posted my question in the Physics previews forum and haven't gotten any answers.

Reposting it here.
https://forum.unity.com/threads/controlling-physics-tick-on-unity-ecs-physics.771635/

Reading through the resources provided, it is clear that the new experimental physics package is designed to be usable over the network due to it being stateless and deterministic.

I'm looking into building a network system that integrates well with this new package. However, to do so, I need a few clear controls:

1. I need to be able to manually call the physics tick, like with PhysX, where I can disable autosimulation and tick it myself. This is because, with a rollback system, I may need to tick 10 times to resimulate past frames.

2. I need to be able to ensure that global ticking happens at a fixed intervals. Fixed updating is key, and I don't see any settings to define tick rate.

3. Are there interpolation settings for the rendering? If I use a low tick frequency, the rendering will look very blocky without interpolation.

Looking at the image below - I'd like to clarify my question in stating that I need control to control everything from "Build Physics World" to "Export Physics World".

This is because I need to set the state, Step through the physics, and capture the exported state afterwards, in order to create network frames I can send over the network. I need to repeat this loop many times per frame.

 

I know I'm super late, and you've probably figured it out by now, but for anyone else with the same question, use the docs for Physics/Physics2D settings. For Physics, disable auto-simulate, and for Physics2D, set simulation mode to Script. Then use a script to call whatever simulate function you need.
Physics Docs: https://docs.unity3d.com/Manual/class-PhysicsManager.html
Physics2D Docs: https://docs.unity3d.com/Manual/class-Physics2DManager.html