Yes, I am sure.Are you sure? I see the hotkey assignment possibility in both Slide Modes, Automatic and Manual.
That is a screenshot of the scene Gaming Last Week. Within the scene showing and hiding indeed are your options (the eye icon).
Scroll through the long list of hotkey setting possibilities to Quotes V2.
View attachment 75743
Trust me that's all there is, I have way too many sources/scenes to show you everything, the "Quotes" source shows up nowhere else other than there in the "Hotkeys" tab.I guess it should show up... there's no scrollbar?
To be sure: try without filtering, just scroll down the list. It starts with general options like start and stop streaming and recording, and items added by scripts (if any). Then all your scenes, alphabetically with capitals before lower case. Then the sources and groups.