I've gotten some feedback that it isn't as intuitive as I thought it would be, so I'll be making some updates.
You get to it by doing a Map->New Map, Bounded, Adjust Grid.
Here's the idea: click near each red line and move it to the furthest outside gridline on the map that you can see. Once you've moved all four sides you should have a red square that roughly lines up to the outside gridlines. Once you have the outside grid set up, use the sliders to change the number of grid cells on that axis. Eventually you should have a grid that comes very, very close to the map's grid. Don't worry that the red square doesn't fill up the entire map, it's just a visual structure to help calculate square sizes, the resulting grid will still fill up the entire map
It's one of the last major features before we go 1.0, and since we've got a slew of super sweet features lined up post 1.0 that I'm itching to implement I need you guys to help us get there ! So fire it up and send in your feedback
