finally! 
i've found an solution to pair my wiimotes permanently with the PC using the windows bluetooth stack. and with "permanently" i mean, that only a button-press on the wiimote and no further software or interaction on the PC is needed. it also stays this way after a disconnection of the wiimotes or even a reboot of the PC. the wiimote behaves with the PC exactly like with the wii.
i did this using using a tool called "WiiPair", which is included in a package donwloadable here. (download the "Wiimote ADC"-package at the bottom of the thread).
i have it working with windows 7 x64 and an ASUS BT211 bluetooth stick.
@dolphin-devs:
to achieve this, i think the tool is using the wiiuse-library, which is written in C. maybe you could use it to implement the same feature into dolphin?
i've found an solution to pair my wiimotes permanently with the PC using the windows bluetooth stack. and with "permanently" i mean, that only a button-press on the wiimote and no further software or interaction on the PC is needed. it also stays this way after a disconnection of the wiimotes or even a reboot of the PC. the wiimote behaves with the PC exactly like with the wii.
i did this using using a tool called "WiiPair", which is included in a package donwloadable here. (download the "Wiimote ADC"-package at the bottom of the thread).
i have it working with windows 7 x64 and an ASUS BT211 bluetooth stick.
@dolphin-devs:
to achieve this, i think the tool is using the wiiuse-library, which is written in C. maybe you could use it to implement the same feature into dolphin?