As far as someone said for the Isometric view. That will be hard.
Cause you are not just changing the camera, you will have to allow the mouse to scroll the view (like the other games), also allow the mouse click to tell the Player character to move to that location.
Not to mention as a 3D game, when the Player enters or near the entrance of a building, you'd have to adjust the camera if it's multiple stories AND change the opacity of the ceiling so the camera can look into the building.
If people really want to do that, there is A LOT of work to make that happen. Not just what I posted above. And even then, that depends on what the modkit (if any) will allow.