ATSKNF is an odd special rule, as it effectively eliminates Morale and Fear from the game but without the disadvantages of fearless (eg ATSKNF troops can still hit and run, can get out of a losing fight then auto-rally and shoot their attackers to pieces, ect), not to mention making entire swathes of wargear useless against Space Marines.

While I'm not adverse to Space Marines being brave, the fact that their entire army has this huge advantage and space marines and variants are hands down the most common army out there makes Morale, which should be an important part of the game, fairly pointless and fear never worth the bulk points it inevitably costs.

So... What if ATSKNF was simply "Models with this special rule may roll an additional d6 and discard the highest dice whenever making Morale, Rally, and Fear checks"?

Would that really be so bad?