The MD Simulation tool in Chimera was developed by a team at the Universitat Autònoma de Barcelona and generously given to us for inclusion in Chimera.  We tweaked some interface elements to somewhat improve ease of use, but none of the work to get the molecular dynamics simulation to run was done by us (though the tool does leverage some Chimera capabilities like Dock Prep).

The ChimeraX programming team does not have the deep expertise needed to write an MD simulation tool, so the most likely route to having such a tool would be if a third party wrote one and put it on the Toolshed.  We have considered adding simplified and extremely localized simulations to help with problems like fitting a small part of a structure into a map, but that has not happened so far.

So there is no plan to add an MD Simulation tool, though some related possibilities could happen eventually.