You know how there's those 2 empty button spots next to the sideview mirror controls? I know that people often use one of them to set up fog light controls. I was wondering what the second one is used for. If there's not already something useful people put there, would it be possible to add a second USB connection to the HU?

 

2nd spot is for anything you want. its your spot now lol. you can possibly add another USB connector, if your HU would support it but then you might just be able to use a USB stick unless you want connections dangling.