To enable a JobSheet, edit the file
/etc/cups/printers.conf
to looksomething like this:
# Printer configuration file for CUPS v1.1.23
# Written by cupsd on Thu Aug 4 11:03:47 2005
<defaultprinter LaserJet-9000>
Info LaserJet-9000
DeviceURI socket://zko03018.americas.cpqcorp.net:9100
State Idle
Accepting Yes
JobSheets unclassified none
QuotaPeriod 0
PageLimit 0
KLimit 0
</defaultprinter>
The unclassified refers to a file in
/usr/share/cups/banners/
that is just a chunk of PostScript that gets prepended to the print jobs. If you feel like hacking PostScript, you can create your own burst page.