Yes, some do raise their 2nd string to an E with a knee lever. And some do couple this with the lowering of the 6th string a whole tone.
But most 'opt to raise the first string a whole tone with the 6th string lower. However, I suspect that as time goes on, more and more will raise the 1st string a whole tone AND the 2nd string a half tone along with lowering the 6th string a whole tone. In fact I will go out on a limb and state it WILL be standard in the not too distant future.
I ordered my U-12 with this very thing. I have since taken it off; for three reasons:
1. The knee lever was just too stiff for my tastes.
2. Because I use the 6th string lower soooooooo much (mostly for splitting), it was putting undue stress on the 1st string. And even with a changer that does NOT break strings, this was exceeding the mechanical limits of this string and simply asking too much from it.
3. Coupling these changes with the 6th string whole tone lower (and 10th string whole tone lower (on my U-12), messes up the chord on the first two strings.
Buddy Emmons splits these two changes. That is, he puts one on the knee lever above and the other one he puts on a pedal. I forgot just which one does what. I am sure its on Ernie Renn's Website, but I am too lazy to look it up
I will raise 1 a whole tone, raise 2 a half tone AND raise 7 a whole tone on a separate lever soon. All of these changes are musically necessary. Time will show this exceedingly to most players I predict. Players like PF and BE have such incredible ears, they hear these sounds in their heads often before they install the change on their guitars.
Which contrasts sharply (in most cases) with the way most players do. But then Buddy and Paul are not most players. This is of course why they have acheieved such awesome status in the steel guitar world. In a word, it is why they are where they are.
May God richly bless Paul Franklin, Buddy Emmons and all of you,
carl