Hi, Zander. What is the measurement setting (under "Page Settings") on the page in question, what behavior do you expect, and what behavior do you see instead? Are you proposing a different measurement system from one of the four already available? From the Ruler help page : 1. D&D 5E/4E Compatible is the default setting.
This measures a diagonal move as 1 unit. This simplifies the counting of
squares at the expense of realism. 2. Pathfinder/3.5E Compatible measures a diagonal
move as 1.5 units (rounding down). Thus, when 1 unit equals 5ft,
diagonal moves alternate between 5ft and 10ft increments (i.e. 5ft,
15ft, 20ft, 30ft, etc.). This is slightly more complicated to count, but
models reality more closely. 3. Manhattan measures a diagonal distance as the sum
of its horizontal and vertical distances. Effectively, a diagonal move
equals 2 units using this method. This is also called "Taxicab geometry"
or "rectilinear distance". 4. Euclidean measures diagonals using the
Pythagorean Theorem. A diagonal move equals about 1.414 units using this
method. This is also called the "real distance" or "as the crow flies." The GM can change the default measurement setting in their Game Settings.