To your first question:
You could switch off the background of your Split Screen Layer:
Find Background, click the color and set Opacity to 0%. Now it’s transparent. You can do this with all your variants of the Layer. Now: Underlay any other Layer to place your animated/moving background (maybe a pip-window-layer with several positions?
BTW: To the second question:
With PIP-Window you can design your own Spit Screen (including transitions/movements).
For every face use one Layer. Add variants for several positions. See this demo, how it works. You can add as many variants you want:
Remember: One Layer for each face/content. X Variants for your Positions of the faces. Combine every view in LayerSets.
BTW: With this layer you can create your own transitions.
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Switch on the “MultiView” and add your Sources, to have smoot transitions.

(It’s the left button in the top right corner of mimoLive)
Lot’s of fun,
JoPhi
