[Boomerang]

The way I run ATR is that time actually elapses differently for that character. One level lets you fall twice as far and fire a weapon twice the normal maximum ROF.

I also think the advantage should grant extra actions at higher initiative counts not lower (or the same). So basic speed 7.50 and one level of ATR should let you act once at initiative count 15 and again at 7.50. The advantage costs 100 points per level, it should be freakin awesome not merely good.