They made me think about the use of this feature in PeopleSoft. In most PeopleSoft systems there are lots of empty tables, sometimes because not all the modules delivered in the database are in use, but also because not all the temporary table instances have ever been used. This blog entry from Tom Kyte feels very close to home
Deferred segment creation is available from Oracle 11gR1. From Oracle 220.127.116.11 this becomes the default, so there is no need to reconfigure anything in PeopleSoft in order use this Oracle feature. You may want to drop empty segments created under previous versions of the database.