The RKR dropping to D is a compromise that yields some new possibilities as well. Can get the dom7 with E and A using that or the split on the 6-string.
![Image](http://bb.steelguitarforum.com/userpix1403/149_E5_A5_PSG_Copedant_2.jpg)
The top part is of course pretty standard, and the tuning fits all types of music, just sacrificing some of the beautiful complexity of the lower strings of E9.
I have this tuning on all-pull Williams D-10 w/Tonealigners, with a standard C6 tuning on the back neck.
On my Emmons I have the traditional E9 on the front neck, but it is not too difficult for me to switch back and forth depending on the type of gig.
(Edit: The RKR drops String-2 D# to D/C#)