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Hi HaxorViper. You are correct in assuming that the new update makes making simultaneous turns a lot simpler to implement. The devil is in the details, though, and certain forms of simultaneous turns are a lot simpler to add than others. If the “simulated” server-side actions are still run in sequence and they are just animated in parallel this is quite easy to do. You would just need to make sure that the actions are added to the action queue in the order they should be happening and set any actions that should happen alongside other actions to “withPrevious” in the QueueAction macro.
However, if things are happening simultaneously also when it is simulated you run into many of the same difficulties as in previous versions of the toolkit. For instance if you want a unit to move to an index and that unit can potentially be killed by another unit which inputs its action “after” this unit. but kills it midway though the movement you will need to make a lot of modifications to how actions are simulated. You would probably want to have a second step of simulation after the initial simulations where you look at everything that will happen one turn and modify what is happening based on how the simulated actions interact. This is quite tricky, but depending on just how interdependent everything is it should still be possible without completely altering the core of the toolkit.
In any case this is a pretty advanced modification, though, and one that I have not attempted yet, which means there might be other issues I am not seeing a priori. Since you are new to UE4 I would recommend you not to tackle this as your first task. Which is why it is great to hear that you want to make Fire Emblem style fan games first. If you complete and release a Fire Emblem style fan game you should have acquired a lot of knowledge both about the toolkit and UE4 more generally, and you should be well equipped to tackle challenging modifications like this.
Thanks man, you are right, I am not ready to tackle something that big, I just wanted to make sure that it would be possible to do in the future. I am relieved to hear that it is and I just need to learn how to heavily modify the system. Thanks for the information and I will let you know when I am ready to tackle onto something like this. Cheers!