I'm pretty sure this perfectly explains why they aren't going to give us a much easier option, however much we might want it. In many, many cases, KB>KD is a big increase in DPS.
I think the best we can expect, and we should keep asking for these things, is more access to Draw In powers, more access to -KB in AoE abilities, and possibly another set or two with KB>KD IOs (with more flexibility than Sudden Acceleration, hopefully) AND, maybe, some modifications to KB CHANCE in AoE abilities.