Based on what I see of the style, I'd have to say 'yes'. It isn't being treated as an improvised weapon; it's being treated as a straight up mace. The rule of thumb is that you can use pretty much any weapon in an "improvised" manner, such as hitting someone adjacent with the butt of your spear, but it isn't a spear when you do so so you gain no enhancement bonus, no weapon training bonus, no nothing bonus (except stuff specifically directed towards improvised weapon). But if a feat or special ability is saying you can use the weapon in a particular manner, presume that it also benefits from any relevant bonuses unless the ability explicitly states otherwise.
