Hi 20degree,
I think i have seen such an addon. But i am not sure where and when. Milkshape 3d is too uncommon nowadays to include it into Bforartists though. And i am pretty sure that you would need to fix the addon too, since it was for Blender 2.6x as far as i remember. So you would first to convert it to Blender 2.8x
In general we just include the official Blender addons, plus our own ones. No third party ones. As sorry as i am, we lack the manpower to maintain addons too.
Kind regards
Reiner
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