I vote no; I don't want people to be able to shoot in the tower because it's likely to be distracting and take some of the chill vibe out of the place. First time I get shot with a missile (even a harmless one) while I'm trying to talk to the Cryptarch, that might be vaguely amusing.
The hundredth time? No longer amusing. I don't think Bungie made the tower a weapons-free zone arbitrarily.
If a shooting range in the tower was fully contained and I didn't have to listen to the people shooting in it, that'd be cool with me.