Look at your trackpad settings under System Preferences>Mouse & Keyboard
As far as the battery...anything over 95 percent is considered charged. It's kind of annoying to see it not at 100 percent, but that 5 percent isn't going to add any huge amount of time to the battery life; only a minute or two. If you really want it to go to 100 percent just unplug it for a couple minutes and plug it back in again. It'll charge the rest of the way.