Hi @swrpug , how are you?

I do have a plan / desire to support compound states. I've worked on a PR to try out a proposal for the syntax, but it's being idle for a while: #329

Nice that you have interest in this feature. Feel free to contribute.

It would be great to have compound/parallel states, sure! Ideal would be to be able to digest scxml files like QScxmlStateMachine.fromfile(). The library xmltodict is very handy to parse automatically the xml file to get a dictionary with the description data, and it could be not be too difficult to create automatically a state machine from it. Using a graphical tool like QtCreator is definitely more user friendly to design a complex machine than in-line coding...