Shaking a virtual wiimote

I have Super Mario Galaxy 2 in the Dolphin Emulator. Since I have to point for certain things and use the joystick on the nunchuck for general movement (and I don’t have a USB sensor bar), I want to play with the nunchuck in my left hand and the computer mouse in my right hand, while the Wiimote just lies around (because I don’t have a third hand).

Everything works fine except for shaking the Wiimote (and a certain nunchuck problem, but that’s a different question). I set shake X to the middle mouse button (Click 2) in the hybrid Wiimote settings and it does rapidly shake the cursor around, but it doesn’t make Mario spin.

Interestingly, if I click Movie->Start recording input, shaking suddenly works completely fine, but Mario keeps ducking and no input from the real Wiimote (or nunchuck) are accepted anymore. And apparently I can’t turn recording off again by any other way than closing the game.

Setup:
American version of Super Mario Galaxy 2 (SB401?)
Dolphin 5.0 (ac267a29405ae768037a8774b84b805a4180d1af)
Windows 7 Professional 64bit +SP1

How do I shake the virtual part of the hybrid Wiimote?
If it’s possible to just fix the “Start recording” behaviour, that would also be ok, although inconvenient, because I would have to click it every time I start the game.

(Possibly related question)