mh,
Grenades for the Grenadier Unites. Problem is of course that Grenadiers would then be overpowered as hell. we saw it happen in "With fire and Sword" which was in multiplayer totally ruined by some guys running around with 10 Grenades and stuff and could blast almost every enemy into tiny little bits.
If Grenades would be added to NW it should be done (at least in Battle mod) similar to the partizani units of the Russian empire.
This unit spawns as you know with random equipment. Imagine a line of Grenadiers spawning and two of them receive one single grenade. This would not ruin the balance cause you cant throw them that far so that you have to be pretty close to the enemy which then, of course, has a higher possibility to shoot the madman who is currently running at ,them screaming and shouting war cries and waving a nice little grenade in his hand