how to use default values?

Hi, in the ChangeLog , about new features from version 5.0 to 6.0 is reported:
***** ChangeLog for 6.0.0 compared to 5.0.* *****

NEW: Can define default values for create forms.
NEW: Can define default filters for list pages.
NEW: Can define default sort order for list pages.

I can report that the default values are working only for <input type=“text”> fields. I tried many times on <select> type fields, but no default values are passed.
Using either the ‘name’ attribute or the ‘id’ attribute of the combo select, setting the field with the select name or even with the select.options[] array, no results are given.
Is this true, or I’m doing some mistake? There is NO documentation about this feature, can anyone help me? Any developer?

And i have that problem…