Impress - PowerPoint equivalent for these settings

users
#1

I have a Raspberry Pi driving a kiosk where users simply dump a PowerPoint
to a shared folder whenever they want to update what is shown.

Unfortunately, users creating the shows are still on Microsoft Office.
Things generally work out fine except that I can't control the following
setting in the Impress Slide Show Settings:

Type: Default/Window/Auto (with a delay setting).

At the PowerPoint side, shows are saved to loop continuously, and Browse at
a kiosk.

When saved as ppt files, the show opens in Impress with Type=Auto at 10
seconds.

When saved as pptx files, the show opens in Impress with Type=Default.

This is an unattended computer so I cannot go in and set up the Impress
show manually each time. Is there a way to set the show Type to Auto=0
globally?