Kudos to the discussion on the prior post for getting the ole tinker going ...
The what if here could* (definitely not saying WOULD) lead to broader allowance of SH/Gargs, Knights, etc. This addresses big issues for negative reaction from players, such as Lynxes blasting you with D from across the board and Knights 6-stomping all over things way out of combat with them and the like.
Is your Ranged D weapon more than 12" from target? Treat any "6" as a 5.
Is your Melee D weapon or Stomp hitting a target you are not engaged with? Treat any "6" as a 5.
Ponder and Feedback.
Maintains ability of "6" results on D and Stomp to mitigate concern regarding 2+ re-roll units without having to enact wholesale changes to Invisibility, Grimoire, Fortune, etc. (one change vs. many)
May allow for broader inclusion of peoples' "toys" in the form of Lords of War.
Prevents need to heavily modify / ban brand new units and future units with D (aside from Lords of War) if the Eldar Codex is any sign.
It's a rules change
Some people don't want ANY D in the game at all