Hi Frenchy,
"""""""""""Another thing : what about put a new image icone button for a specific command on the CommandBar?""""

You can make your image (I think he made his at 64x64 pixals) then go drop it here, and copy the result:

http://base64image.org/

Then edit the corresponding file here:

C:\Program Files (x86)\MoI 3.0 beta Nov-19-2013\ui\customui

and replace the base64 encode with yours...