The Linked Values Balancing Tool is designed to take some of the pain out of balancing over multiple objects, without having to code a custom editor.
Download the asset here:
Documention:
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Hey imtrobin,
Yeah I was being a bit preemptive with this one and its not released yet 
Was feeling very close when I made this then realised I had more to do and typically work got busy so its been delayed 
Hoping to have a copy uploaded by the end of this weekend though