(In reply to pbasista from comment #1)
Can a regular user currently change this ratio in any reasonable way (i.e. without using a different screen)?
The browser's reflowing-zoom scale (controlled with Ctrl+Plus/Ctrl-Minus) affects it, but that's presumably not helpful.
Or, more generally, is it currently possible for a regular user to configure the maximum amount of pinch zoom that is available?
If not, could it be made user-configurable?
There is no current way, the values are hard-coded here.
I think making these user-configurable (but still within some wider bounds) is a reasonable request.
Could you file a separate bug for it please? We still want this one to track how the default min/max values are affected by the DPI.