No Game Controller needed for Bootmii NAND Backup (worked for me)
I noticed while doing the NAND backup (atleast true for me), that I didnt require the Game controller to select.
The power button was working perfect for scroling the Menu but Presing the Reset button was resetting the WII.
So, for Selecting the menu, I had to keep the Power + Reset button pressed together. The trick I used was with Power button go to the Selection you want and dont release the power button. Keeping the power button pressed, press the Reset button which should do the trick.
I dont know if that is helpful to anybody but try.
Correct me if I am wrong in saying this.