Yeah, I definitely can see where it'd take a bit of programming to do something like "place the front icon first, then place the back icon while pressing Ctrl as you click on the space." That's a fairly intuitive way to do it interface-wise, but I'd expect programming it to be a real bear. And while there are plenty of icons and icon combinations in my set that would fit the general rules in the main article, not one of those is represented on my sample board.
Yeah, I definitely can see where it'd take a bit of programming to do something like "place the front icon first, then place the back icon while pressing Ctrl as you click on the space." That's a fairly intuitive way to do it interface-wise, but I'd expect programming it to be a real bear. And while there are plenty of icons and icon combinations in my set that would fit the general rules in the main article, not one of those is represented on my sample board.