[DrKvothe]

I'm not sure if you mean that it's been changed, but previously only top slot let you chain cast. You could alternate between spells without gcd when using clicky, but only top slot could be chain cast.

I always had a root spell in top slot. I found that the times I needed to root multiple times in a row without worrying about GCD were much more important the times I'd like to canni multiple times in a row.