Is there some hidden setting to get this functionality back? I've used it all the time...
There isn't, sorry.
Just updated to 13 and that is the first thing i noticed 
Any way of requesting this to make a comeback possibly?
As an old Opus user who's adored this feature since wayback when on my Amiga 500...
i miss it terribly already and agree with @gmit - i've also used it all the time.
Posting here is enough. 
If a lot of people ask for it to come back we might do so, although it's one of those things that added a lot of complexity (testing as well as the code itself) for something most people didn't even know was there.
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As a dev, i totally understand and feel your pain.
I have cast my vote, made my voice heard and shall now return to obscurity and silently whisper a prayer once in a while 
Thank you for another great update and for Opus in general 
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