Got my 2.1 yesterday, today I built it! Pics

[queekus]

quick question about some of the extra pieces:

1. white connector terminal, I'm assuming that can be used to connect a second battery to the board if you had 2 flat-cell type batteries
2. 4 pin header, no idea what that is for
3. 2 button caps, THANKS!
4. OTG adapter, THANKS!
5. 4 screws, not sure where these were supposed to go.

Also, can I clip off a little of the y and x button shafts if i want the button caps to sit a little lower?

Thanks!

L