For Lr to have user-creatable presets in
the dialog box for 'Copy Metadata,' Sync Metadata' & 'Add User Preset'. This would save many checking and unchecking tick boxes when Copying, Syncing and Adding Presets
I like this proposition very much. But You will have to name them, and if they are fiew only then this could be much faster, no ? : on the right side a column of, say, 5 big buttons with each a tiny reset/memo button to its right. That way You can hit a button and see how all the ticks jump for each scenario, faster. I think one would feel more control-experience. But Your idea is better if Your naming has a global meaning referring to workflow. Maybe combine solutions; the buttons as shortcuts and make appear the name of the preset.
(BTW : Many scroll-down menus are getting long and as long as I don't clean them up now in a wile, to have to scroll all the way down -and only with the arrow when out of monitor real-estate - to eventually find the option "modify current preset" ..is awkward..)