Measurement and movement is just as much a function of the game as the stats behind it. What information you have available to you at any given time is only relevant within the ruleset.
But if you'd like a more anagolous, but no less absurd comparison, we need look know further then pre-measuring maneuvers.
The rules tell us that during the Planning Phase that a player may not use the templates to test possible options and instead must estimate. The rules do not, however tell us that a player can't use the templates (or another device) during the End Phase or Activation Phase or Combat Phase in order to test out possible positions. So on that basis would I be allowed to do so?
The competitive rules for aquiring a Target lock tell us that if you measure range and the prospective target is within range you must take the lock. But the rules don't say I can't pull out a tape measure or walk my hand span across the board to get a sense of the distance before actually attempting the Target Lock. So on that basis is the legality of what I am suggesting somehow up in the air?
The answers are clearly no. No reasonable person could assert otherwise. The issue at hand is no different. No reasonable person has any grounds to assert that the rules, in any way, allow the pre-measurement of action related movements through any means, even if non-template.
Edited by ScottieATF