I just released a new script for 3DSMax which lets you copy and paste (or unify) the length of selected edges or edge loops. It also lets you get/set the distance between verts or objects. There are a lot of one-off scripts that do some of what it does, but I thought it would be useful to have something a bit more flexible.
https://www.youtube.com/watch?v=X3UOiE__z7sIf it looks useful to you, the script can be found on my Gumroad page over here:
https://gumroad.com/polyhertz