I processed more than 200,000 images last year, all weddings with very variable lighting, some shot by better photographers than others, which added to the variation.
I love AutoSync and I use it constantly, but it's not the solution to everything. There's no way I'd consider moving sliders individually for all of those photos. I ended up with serious RSI issues from trying to do that in ACR for my first few years before LR came into existence, with far lower volumes. My ShuttlePro / Wacom pen combination works really well for this situation now, but there's definitely a valid feature request here for volume users.
Custom shortcuts would be best case scenario, but not required. These shortcuts don't need to compete with existing shortcuts - all of the users I've spoken to are just wanting to be able assign the shortcuts to custom keyboards and other gadgets.
The fact that RPG Keys, Motibodo, LR Paddy, Autohotkey, Knobroom, and all these other variations exist proves that there is a significant chunk of the userbase that would find it useful. One could say that these existing products already cover the need, however they each have significant performance or workflow issues that wouldn't exist with a LR-native feature.
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