When I use my 27" 4K monitor I have global settings to Maximize Window Left, Window Right etc. and those do 50% of the screen, which is great.
When I am using my 13" MacBook Pro 50% is too small, and it really needs to be 66%
'The shortcut keys and also the Window Snapping should implement these different % options based on Resolutions to make it easy to control. (This would autofill from the display being used at the time, for example1680X1050 for my MacBook Pro) this would be great if defined by resolution, so when hooking to another 4K monitor, those defined %'s would stick and just work.