< But I can't see why you would expect to have that as part of the regular UI... What is the purpose that you would use it for again? Maybe you could give an example?
If you can have that in the regular UI : perfect!

< It would be possible to make a plug-in that would do that. :
perfect

In this case, if i have the list I can see if I have forget something
Same number of Objets and / or groups