/3/ - 3DCG

Anyone know of a good way to control arrays in a way you can just drag an empty and it adds objects like dragging the corner of a rectangle?
Webm related is what I came up with, but it only works on one axis (still useful when I've got multiple objects that have arrays and need to match up). Ideally, I'd want to have 2 arrays set up to where I can drag the one empty vertically, then horizontally and it fill that space. I could do it with 2 empties I guess, but it'd be nice to just drag 1 empty diagonally and have the arrays fill the space. Like just saying "this is the area I want it to fill".

If anyone knows a better solution than what I've got going on here I'd be all ears. Drivers are a bit fucky. Or at least I'm not super great at using them.