This looks pretty cool. I'm on a phone, so didn't look at source, but I'm curious about install procedure (also see an issue about brew).
As a web dev, I think I'd like to see this work like a css grid. Width then height. So, ^3^2 would be three columns two rows. Maybe that won't work in practice. Maybe I'll play with the code to see.
Right now it is a simple download from GitHub though I have already submitted a pull request to brew cask. Thank you for opening the issue which finally motivated me to do this.
The tool does work like a grid but with start and end positions instead of sizes so you can move and resize at the same time. ^1^3 is from position (1,1) to (3,1) (i.e. top row), ^1^6 is (1,1) to (3,2) (top two-thirds) etc. You can basically paint the location and size of the window using your numeric keypad. Its pretty straightforward once you try it.
