I just tried this. Interestingly I'd left it on v68 and it cooked my MBP, fans all on max immediately. When I updated to 70 it seems to work perfectly. CPU temp in the 40s. Gonna leave it on in the background and see if it suddenly spikes.
That's a slightly worrying precedent, they're calling the way to diaable certain bits of obnoxiousness (the header bar in Tree Style Tabs comes to mind) "legacy", which is usually a precursor to removal.
Is there a new method available/forthcoming, or is this more control planned to be wrenched out of user's hands?