The defaults for addDefaultWheelListeners are:

• Mouse wheel scrolls vertically
• Alt key + mouse wheel scrolls horiontally
• Shift + mouse wheel scrolls faster.
• Any mouse click or wheel event will focus the inner widget if it has tabStop = true

The defaults for addDefaultKeyboardListeners are:

• Arrow keys scroll by the given amounts
• Shift+arrow keys scroll by the given amounts times the given shiftMultiplier
• Page up and down scroll by the vertical viewable area
• Home and end scroll to the start and end of the verticle viewable area.
• Alt + page up / page down / home / end will horizonally scroll instead of vertical.

My recommendation is to change the scroll amounts if you are scrolling by pixels, but otherwise keep them at one line.