Fill factor based on index ranges
Unless you plan on regularly updating portions of your table, I'm curious why you would set your FILLFACTOR on the table to anything other than the default of 100%?

Regarding your question about different fillfactor settings for the same table, I don't think that is possible. If you were planning to set the fillfactor per index, then that might have some benefit -- but if you are only inserting then set the fillfactor to 100% (or close to it).