Thanks Don!
Showing my stupidity, I have never had the need to look into my fuse panel so I didn't know there were spare legs in inside! 
Usually so. With a test light it's obvious which side of each pair is hot. It'll be hot whether there's a wire on that side or not (come across fuse panel). So just add your new wire to the other side.
The small orange locks that block access to the terminals can be removed with a small pin tool or small screw driver. Obvious when you see them up close too.
Only thing to pay particular attention to is a couple of unused fuse locations immediately next to and "downstream" from the relays. If memory serves you can't use those holes to add new circuits as the power that gets to them is intermittent dependent on what the relays are doing. Aside from those, however, any open hole is fair game.
I didn't want inline fuses in the fairing. More hassle than it's worth for a simple blown fuse. So my heated grips, heated seat, added power saddlebag locks, GPS power and power for the EMS tuning module all come back to the fuse panel. It's nice having all the fuses in one place where you expect them to be.