Attaching a static box to a moving camera won't work as the physics body will just sit in the scene.
If you go to the scene setttings, you will find out what i mean
I will test the command to change active camera again. I did leave this feature working when it was created, but it seems a few things have slipped over the past many months. oh well. lol more bug hunting haha
As for the spline path, i have had this happen to me aswell last week when working on a scene for another user.
Will try and fix it if i can find the time, but time is really stretched thin atm with all the ongoing things trying to reach this release. Many new features and old features to fix hehe
As for the particles, a use case might be handy, but will have to give it a go myself when loading another scene while running the game. I think this is what you mean.

