Set default values for various options

There are several options that don't have a default value set. This
results in bad user experience as there is no default in single
choice lists.

Change-Id: I9f39387597dc9fa5a245c2112b9f6ea9b7020a30
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>
Merge "Set default values for various options" into kitkat