TYPO3 Core

The reason for this can be found in
ext_tables.php:

$TCA['tt_content']['types']['list']['subtypes_excludelist'][$_EXTKEY] = 'layout,select_key,pages';

If you comment this line out, then the staringpoint and CODE field will be shown again.
So maybe it is a wanted feature. However then the documentation needed a modification.

The plugin code apparently does neither uses CODE nor Startingpoint.

Franz, I'm questioning whether you are reading the core list or not? AFAIK that change was proposed & performed by Martin just one or two weeks ago!

There was a good reason for removing the field, so we better don't change it.