Have some sort of method to "pin" the ruler you just placed, possibly by
right-clicking. As it works right now unless you are playing the grid,
moving miniatures is awkward as hell. I take the ruler, measure the
distance from my miniature to where i want to move it, then de-select
the "ruler" tool, select the "move" tool, and by now i forgot where
exactly my miniature is supposed to end up. This becomes a very big
issue when moving on a board that has no sort of landmarks that you can
go by.