Here's one:
With the IO set bonuses now in the game, sometimes my cumulative totals show something other than what I expect. Would it be possible, on the "Cumulative Totals (For Self)" window to allow you to click or hover over the stat and get a window showing what is affecting that stat?
F'rinstance, on my Dominator I have 2.4% defence to all from Combat Jumping, but looking at my cumulative totals, I'm noticing a reading of 4.9% defence to Lethal. With my proposal, I would simply click the lethal tag, and a window would pop up saying: "Combat Jumping: 2.4%, Enfeebled Operation: 2.5%" instead of having to pore through the set bonuses to see what's adding that unexpected bit.