FH is the original game made by Kov. FH+ is an altered version with new maps, new textures, and yes, at the moment, bugs. (Edit: And no, the FH+ maps are not available in regular Feral Heart, as they are linked to the FH+ versions of the maps.)
Items can be download via various threads on the Feral Heart Add on/Mods section of the forum. Directions are usually included.
Animals do not move, if you mean the meshes. The characters themselves do move, yes.
Placing portals? You just usually place the map files into exports.
Old IT maps are only available if made into FHM. files.