I turned off dots on slashes for a 12/8 afro cuban thing in an effort to reduce clutter, and it worked…mostly. Oddly, this one incomplete bar didn’t get the message:
Hi @Candlebane, Dorico has an Engraving option to show or not show dots on compound TS. But also with deactivated dots, it will show dots on Slash Regions that occupy only a portion of a bar, for clarity with the rest/notes subdivision for the remaining beats that are not in the Slash Region
I found out a trick, reducing the slash region to 3 bars, and using a hidden 6:9e tuplet with a new slash voice without stems, to avoid the dots for the last bar of the original slash region in your example: