I like the idea of changing the opacity of the grid lines, I always thought they were too horsey. But now they seem too light. Maybe it's my graphics driver or monitor but my grids are barely visible. I hate to suggest this, because it's what everyone requests for all sorts of options, and it's probably not easy, buuuuut: A slider would be great here. 
Laptop: Gigabyte P34
CPU: Core i7
Graphics: GTX970M
