Now i know that you can use other programmes to create meshes but haveing a special unreal engine mesh creation and animation tool whoud be awesome. Imagine how much easier animation and mesh creation whould be you whould not have any compatibility problems because it is literally made for unreal engine. And im not talking about some simple modling plugin, i mean very advanced modling tools like blender and maya. Please add this in, it whould make game making easier. 
Epic is looking into improving the BSP tools available in the engine. However, that is not meant to be a replacement for a separate modeling program. For that purpose, a separate modeling program will be far ahead of whatever Epic could develop and it wouldn’t be worth the development time.