Hi Pilou, also there is a plug-in that I wrote called MoveSliceToPoint which can be used to help with arranging a number of slices to equal spaces, it is here:
http://moi3d.com/forum/messages.php?webtag=MOI&msg=2749.36

That's a different kind of thing than how a "Distribute" function works in a 2D illustration program though.

- Michael