I think it does!
the first link:
“This also applies to the DEFAULT value settings of the CREATE TABLE and ALTER TABLE panes and the MAPPING option of the Migration Wizard when using the three of the above KEYWORDS that may be used as a column DEFAULTs (they are NULL, CURRENT_TIMESTAMP and localtimestamp). “
so the KEYWORDS NULL, CURRENT_TIMESTAMP and localtimestamp can be useed for column defaults. Functions cannot – except for now() that is internally represented as a synonym of CURRENT_TIMESTAMP.