#1 - don't drink and pull plastic at the same time?
#2 - I prefer to minimize connections directly on the battery terminals so I will have one connection for my battery maintainer (sounds like you already have that one). The only other connector to the battery I make is to my fuse panel to provide power to gadgets that is isolated from the factory wires and turned on via a relay by the ACC of the bike. I recommend never getting power for stuff from anyplace other than directly from the battery in this way (ok to use bike signals or wires for relay triggers since that is only a few milli-amps at most). I will be doing just that in the next week or so, or maybe tomorrow. I'll be putting together a document with a diagram and pictures I hope, and post it on this forum when I get it.
For now I jotted down this diagram and scanned it in. Hope it's clear enough to read. Any questions just ask.
Run ground wire from any/all add-ons to the nearest good ground point. This diagram covers where power comes from. The only bike wire/plug/pin to tap into is the ACC (bottom left) in the front (or rear) option plug. The electrical diagram in the service manual does show what wire color this is. You can find the front option plug location in the SM diagram on page 1-24. It looks to me that it is in a holder just behind and to the right side of the ignition switch under the top shelter. Unless you have the non-USA model with the grip heaters it should be the only 4 pin plug in that holder. If you do have the Honda factory grip heaters it will be the bottom plug in that holder.
For a good ground point I have been known to use a household AC panel grounding bar with 6-8 positions and run one 12ga wire from the battery neg terminal to that bar and run all my added stuff grounds to that bar.