Black & White made intensive use of Level-Of-Detail. Currently 3D GameStudio supports 4 levels of detail for models only (Extra Edition and above). Also, the rendering algorithm is optimized for indoor levels, thus your framerate won´t benefit from it.
I have no doubts that it is possible to create a similar game with good framerate using A5, but it will require a good deal of programming on your part to make it run fast enough.