I created an AHK script which improves the camera in the game. 
You can increase maximal zoom of camera and you can tilt camera with vertical mouse movement while middle mouse button is pressed - in other words - a classic 3D camera movement. 

Installation 
======== 
1. Download the script
2. Extract 
3. Start the game 
4. Start either "Dos2Camera.exe" or "Dos2Camera.ahk". Whichever you prefer but in order to run .ahk you'll need to download 64bit version of AutoHotkey first (www.autohotkey.com).
Also if you choose to use Dos2Camera.exe and the game is launched with administrator rights you have to also run Dos2Camera.exe as administrator.
5. Wait for the script to scan the game memory - can take several seconds 
6. Enjoy 

Settings 
====== 
"Max zoom" is the zoom limit of camera. Default value in game is 19. Default value in script is 60 which should be sensible but you can change it if you want. 

"Tilt Coefficient" is the speed how fast the vertical movement of camera is. I found that 0.005 is quite sensible on 1920x1080 but you can increase it or lower it if the movement is too slow or fast. 

"Invert Vertical Camera Movement" allows to invert the movement. Default bahavior is that moving the mouse up tilts the camera backwards. 

Notes 
===== 
- Moving the camera while using this mod uncovers a huge regions of map. This is caused by the way the fog of war works in the game and can't be prevented.
- This script should not be dependent on the game version so it should be compatible with future updates. It should also theoreticaly work with any other non-gog version.
- If you have an issue with camera zooming all the way out when using skills try to disable "Dynamic camera" in the in-game Settings->Gameplay


Divinity: Original Sin EE version of this mod can be found HERE