It's sorted 'cos it's a 12, but Nippy's cancelling doodah was mentioned earlier......
It's called a signal minder and it's made by Kissan....I've had one for a year and it's excellent......
It's a straight plug in swap for the original BWM flasher unit that lives in the fuse box.......20 secs to fit or remove........
You can select three periods before the indicators cancel..mine last about 8 seconds, but if you've got the brake on (ie waiting at lights etc) it overides the cancel function until the brakes are off then it carries on its countdown to turn them off. (that's assuming you conect the single wire to the brake light to activate this function)
It also runs the indicators as running lights, on one of three didfferent brigtnesses.......or off if you'd prefer.....just adds a bit more visibility maybe?
I've also got (and this was the main reason I bought the signal minder) a pair of Vectralights......little LED strips that act as repeater indicators.....they're red on the back and amber to the front.....
The reds glow double bright when I brake, and they all scan upwards when I indicate (ok, strictly speaking they're illegal 'cos it means I'm showing flashing reds to the rear but I've neve had a problem even riding in front of the fuzz)
I put them on 'cos my Vernatechs are so big they obscure the rear indicators from anything more than about 30 degrees off my rear centre line.....not good, but with the vectralights on the outer top corner of the panniers, the indicators are visible all around (plus I've got outer edge markers in case anyone overtakes at night

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Thoroughly recommended for any 11xx series or previous GS model