Hi Pilou, I don't know of anything that does that currently but maybe the ScriptArray command could be adapted for that.
http://moi3d.com/forum/index.php?webtag=MOI&msg=5595.18

Or maybe if it is spacing between already existing objects you want to target some modification of the Distribute command:
http://moi3d.com/forum/index.php?webtag=MOI&msg=8503.13

I'm not entirely certain what it is you're trying to do - replicate one object at an increasing interval?

- Michael