A better grid

Instead of only snapping to center, allow snapping to corners and edges as well. This would effectively keep the visible grid size as 1, but have an invisible grid at 1/2. This would be useful in placing objects like doors, for large creatures trying to squeeze down 5 foot halls, for measuring line of sight (seeing as it involves using ruler on corners), and countless other uses.   I haven't found a good way to do what I'm trying to do accurately, without cutting grid size in half and trying to line up bolder grids. This becomes tedious and would be much better built in.

There's other ways to say this...having a checkbox to display odd or showing 1:1, 1:2, 1:3 etc lines could work as well though the first of those two seams less confusing...unless people have need for more versatility.

Hmmm while I can see the use of this to some extent as you can hold alt and the snapping doesn't effect doors and whatnot it isn't something I can see a huge need for, not to mention while creating the map you can set it to 1/2 just during the mapping for map alignment however holding alt will pretty much solve all your other issues. Goodluck

Being able to snap to an invisible centerline both vertically and horizontally would be awesome for making dynamic lighting drawing easier and open up more complex shapes of dungeon tiles.