The thing is that something which works fine in one mod, not necessarily will in other mods. There's no easy way to put item in left hand, and when it comes to dual-wielding, it's almost impossible to do currently. You can only fake it by making the left handed item as shield or by making special glove model with left item attached to it, and change player gloves each time weapon is changed. The first soultion sucks in most cases. The second can work just fine, but only when you have very limited number of glove types players can wear and very limited number of pistols or other off-hand items players can pick up. Let's say we have 5 types of gloves (+1 bare hands) and around 10 different pistol models. That gives you 60 special glove models you'll have to add to the mod for this to work.
I didn't play Bear Force, but I'm almost sure it uses the "glove trick", since there shouldn't be many different kinds of pistols available there (one model? two?). Same for gloves.
So for now - there won't be any dual wielding. I thought of adding at least one off-hand pistol to flagbearers, but as far as I can make shooting look quite ok by adding just new animation, I'm afraid it would require a lot of work to script reloading, so it wouldn't look totaly retarded.