If you script the index any fill factor will be included in the script. You can also examine index properties from within EM to see this.
Setting fill factors is an art in its own right, to be honest if you're asking this question then you probably shouldn't be even thinking about fill factors.
Tom, you're actually wrong as the clustered index is actually the entire row, regardless of how many columns of the table are defined as the clustered index, so the assumption that as the key is a sequential non updateable column there can be no fragmentation is flawed.
To test this create a table of an identity + a 1000 varchar with only 20 chars used of the varchar, this will pack around 300 rows per page so you'd need to populate with at least 5k rows.
If you then start increasing the varchar column up to 1000 chars you will get fragmentation.
Agreed if you only ever insert then there will be no fragmentation, but that's a heap ( with or without a clustered index )
[font="Comic Sans MS"]The GrumpyOldDBA[/font]