my own feelings, are that this is not possible - but it would be a nice addition.
You could, if there are not too many actors, just save the scenario file, delete all your actors and then replace them in your desired order, using the same names. Alternatively, you might try some new names and manually change them in the scenario file.
This would allow you to load the saved scenario file and run your animation - but, I have NOT tried this. You may need to review your animation again!
I would suggest trying this first with a 'test' file, if you know what I mean!
Sorry I can't think of anything better at this time.
On balance, I think it might be preferable to leave it as the 'devil you know'.