Unfortunately, due to the language barrier, we're not sure exactly WHAT he was getting at. IE: "button power of the wii" could be a bad babelfish/google translation of "Wiimote's buttons", or "Wii's power button". I believe it's the latter though.
Either way, the best current solution is just to use a GameCube controller for Bootmii.
bootmii loads before ANY IOS so there are no *drivers* loaded for the wiimote. It is not a bug. RTFM. Set bootmii.ini to AUTOBOOT=SYSMENU unless/untill you actually NEED to use bootmii for nand dump/restore or testing .elf files that don't use libogc.
then my suggestion would be too get a Gamecube Controller and back it up that way. use that until either your figure out how to navigate with the power/reset buttons, or until something/someone finds a better way to navigate.
Also, make sure your booting up into it through the installer, the homebrew channel, or your own code of some sort.