I am getting most of MM's Road & Track Kit installed. Prior to buying the parts (H&R race springs, Bilsteins, c/c plates, endlinks, front A-arm bushings, quads, swaybar bushings, aluminum rack bushings, and snubber), I asked MM the same type of questions about bumpsteer and they assured me that if a quality shop installed the parts, I should not ever have an issue with bumpsteer. The aluminum rack bushings move the rack back a small amount and provide more responsive and tighter steering.
Of course, my drop will only be about 1", so there's no excuse for the suspension geometry to be out of whack. A good alignment shop should be able to ensure that the geometry is unchanged and with the addition of c/c plates, a proper alignment is guaranteed. Also mentioned was whether or not I wanted an agressive alignment to which I said "no". Again, MM didn't see any excuse for a bumpsteer issue.
I'll have first hand experience in a little over a week, now that I have an appointment scheduled with T&J.
I'm not knocking Steeda's stuff or anyone that has them. Just wanted to repeat what MM told me which is mostly available on their website.
Good luck.