Do I have any control over using cut-sheet emulation

For all copy groups in the form definition that do not specify N_UP, PSF defaults to CSE when that mode is enabled at the printer. By using the Printer Inventory or installation Exit 7, however, you can request that PSF check page sizes to determine whether CSE should be used. You have two options for checking page size: you can request that PSF check only the first printed page for which a new copy group is used, or you can request that PSF check each front side page. When either of these options is specified, PSF checks the Page Descriptor (PGD) structured field, either in the page definition or in the MO:DCA page, to see whether the page is small enough to fit 2 up on the sheet. If the page is not small enough, CSE is not used; the page is printed in normal 1_UP.