See differing power-ups

Rather than a completely random power-up/explosion when 5 or more objects/tiles are matched, I would like to see those power-ups split into 2 groups - a less powerful group for matching 4, and a more powerful one for 5 (and maybe save the most powerful one for rarer 6-matches?). It would also be nice to be able to swap 2 side-by-side power-ups and create a much larger explosion. And, finally, maybe the power-ups (or their appearance, at least) could be dependent on just what has been matched.