Well, mate don't trying to offend you in anyway, but what you suggest here is pointless.
Like helloa2134 said, your idea have nice Lore aspects, but it is practically balance-faction destroying idea. Dwarven units would be really OP. Point is to have counter units in every factions. If any kind of swordsmen managed to get close to archers, that swordsmen battalion should be able to kill that archer battalion. (It is part of balance) What you suggest in both posts is possibility for that archers to defend themselves(or simply to make greater damage to attacking battalion. No matter you suggest time limited axes for use that time limitations isn't important anyway). Simply they shouldn't be able to defend themselves, that is part of balance. Simple and strict. They are ranged units with reason.
Really, further don't see the point in this discussion.
P.S. Legolas is hero, it is normal to add him that toggle weapon in game, and possibility to buff defence in favour of survival. There are also motivs form Lore aspects, movie moments.