Settings: Custom scrolling values 2/2

ported from https://gerrit.omnirom.org/#/c/4249/
originally written by Yanuar Harry <ai.the.smarties.physics@gmail.com>

PS2: make help icon not selectable and fix capitalization consistency

Change-Id: I89cac4e9c2f5a495339a8495bce11e42f49ee0