By default roundup comes with a minimal set of fields. You can customize the schema as described at:

http://roundup.sourceforge.net/doc-1.0/customizing.html

There is certainly room for an argument about what default fields roundup should come with but I think it is unlikely to change at this point without some significant discussion first.

If that day happens we can revisit what fields should be added. Until then I'm closing this (rather old) suggestion.