Hey, thanks a lot for the very detailed answer! 
Yes, I’m familiar with the limitation and I imagined this was the issue.
I decided to not use world composition, but to use each level separately.
I also plan to move to UE5 precisely due to the double precision 
Hopefully it will work better and certain “hitches” will disappear.
A note regarding scaling the game to smaller units: I’m having both the ships and the command bridge which host the cameras. Meaning that the only way I found so far to make it work, is to use a consistent scale for everything, otherwise I will see the floating point precision hitches in the command bridge, where the characters are small 
I’ll keep trying to figure out the Move Tool as it’s implemented in the editor. It’s really clever and would be the perfect tool here.
Otherwise I’ll use the plan B, which is to make a UI widget and manipulate the waypoints I need to move around by using buttons. Very clunky, but would surely work 