Thanks for writing. I replied to your earlier email on this but the email address was invalid.
Leaflet unfortunately doesn’t support 2-finger panning. It’s possible to do with various plugins, but I don’t have any plans yet to integrate those into MapPress. If you need custom development, please feel free to reach out with the contact form.
Otherwise, you can try using Google, which has excellent 2-finger support. Or, make the Leaflet map less than full-screen (i.e. use a width of 80% instead of 100% to allow for a “gutter” where the users can scroll the page).
You can also submit a request to the Leaflet team here. It would be useful, since it’s best if they add this to their core library: