If we could get Mace Mastery: Shatter Armor to get the Executioner's Strike option from stealth, that would be fantastic. Thematically it makes sense, and I think it would bring Banes back into line as a solid single-target DPS contender.
I know its not necessarily powers-related BUT if we could get some additional options for Mace skins, like the Fire and Ice Sword - Elemental, would be great too. Or even this, from another asset (Rikti Computer) within the game, would be fancy option for not just Banes but Swords across the game.