Add an action group in the middle of a scene

Currently, it is not possible to insert an action group in the middle of a scene

See request here:

Request overlapping in whole or in part with the following feature request:

@VonOx, @GBoulvin, @Hizo and @dumoulin.jb, like me you might be able to pick up a vote because, apart from @Hizo, we all voted for the other one as well.

I’m closing this request to free up the votes and keep only the other request.