I would be more inclined to install a mono or stereo type socket to power accessories. RV's use them. They are smaller than a lighter plug but would require you to solder them on to what you want to plug in. You could also use the mini ones for an even smaller connection.
Not a good idea in my opinion - you never know when you are going to need that 12v outlet to power a compressor or some other device that doesn't have the mini plug on it. There's a reason for standardization. It may not look as sleek, but I'd hate to be stranded somewhere with a non-standard power connection and the device you need to get you on your way has a standard 12v lighter-style plug.
i agree with both. that's why i installed BOTH. the cigarette lighter up top, and "power ports" with switches on the side.
not the cleanest install on the power ports, but i needed them in a hurry. this winter it will get all re-designed.
I put mine (walmart special $4.00) in my left saddle bag. However, the cell phone charging handle was too tall so I moved it (the 12 volt charger) down lovwer in the saddle bag so I can close the cover on the bag. I never talk on the phone while riding so I can put the phone on charge and know it will be fully charged when I arrive.
The photo shows the charger BEFORE I moved it lower, but only the position of the charger is different.