With Bug 12658, a 'Select all options' for non mandatory data was introduced to the install process. It seems that it is no longer there.
Cc-ing Alex since he is working on install process. Please feel free to mark this bug as duplicate if it is covered e.g. by Bug 18346
Resolved by Bug 18346, sorry for the noise. *** This bug has been marked as a duplicate of bug 18346 ***