If I understand correctly what you're going for here, then no. I'm afraid you can not control repeater generated shapes as you'd like to. Through some tricky play with basic transform params you may be able to arrange the array of shapes in certain interesting curvy, or kaleidoscopic formations and whatnot, but that's about it. The relative transforms in the chain can only be incremental. You can't, for instance, have things like circle #4 be smaller than circle #5 and then circle#6 also smaller that circle#5, etc.
no, but I've seen a simple plugin script that will 'bake' repeats into seperate elements (basically duplicating the content and applying the repeat properties into the transform properties) so that you can animate them individually. Never used it, but it is a 'pay what you want' so you could test it out for free: