If they were issued wands with spiked balls chained to the working ends (somewhat medievally looking devices), the need for prolonged swinging would be greatly diminished.
I'd like to see them bring in the "scoops" like they did in Soylent Green. That was the funniest part of the movie.
Of course Kerry would accuse the NYPD of war crimes if they used them.
I was thinking more along the lines of tarring and feathering the Anarchists, But since you brought up the medieval mace, it would make a very nice cranium cracker.