Currently the measure tool uses a nice euclidean distance with a square size of 1x1. Two major improvements could be made here:
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Option to change square size. Probably fine to change once per game. 5’ is common in D&D and derivatives.
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Option to change distance function. D&D 5e uses Chebyshev distance, Pathfinder uses “Pathfinder Distance” (diagonals are either 1 or 2 units, with every 2nd diagonal is 2 units), and Taxicab distance could be useful too. Again, this option could probably be set per game.