i often got a problem when building layout. I use then shift+alt drag to duplicate objet., problem is when there is an object in front of another, selection is change to select the one on top.
And sometime the object need to be on the same layer, if they were on different layer i can lock the layer, that's fine.
But my main concern is when object are on the same layer . So yeah maybe by adding a possibility of locking object, for those who know illustrator: in the same spirit as the freeze object.
i just hope i'm not asking for an option that already exist but i just didn't saw ;D