I love Divvy. In DIVVY you have a universal shortcut to bring it up (control-shift-space is what I use) - which shows a semi-transparent window. Then you can type a single keyboard shortcut, like 1 - full screen, 2 - left half, 3 - right half, etc. In Window Manager, you allow similar shortcuts but your keyboard shortcuts are universal and one really has to contort or fight to find a group of easy-to-type resizing. control-option-shift-2/3/etc is a lot harder than control-shift-space then a 2 or 3, etc.
Greetings, Thank you for posting on Parallels Forum. We've forwarded your request to the respective team for further discussion. We don't know when and if it will be implemented, but in any case - we will let you know. Should you have any additional questions, let us know. Have a great week ahead!