Yay for DP-28! And yes, it was designed keeping Lewis in mind, since it was quite popular during the civil war. It was often fired while standing, way more often than MG, for example. There are numerous pictures for soldiers advancing and shooting. However I have little idea how effective it was for hip-shooting in realitly, given that many of the pics I have seen were not taken in the heat of battle. But then again, would you call Bar effective as it is now?
Just make sure you don't load all 49 bullets into it! (well, same goes for PPSH, -2)