
When toying around with the measurement tool, I found that I was only able to measure from the center of a square, which is a bit of a problem in a system like D&D 4e where measurements are done from the corners of the square, and lines are used from the corners to determine cover.
Only being able to measure from the center isn't a very big issue for measuring distances, but being able to draw the line from corners to other corners would be nice.