Scrolling with MacBook

This isn’t exactly a real problem but perhaps a missing feature, but I’d still be eager to see this fixed in later versions.

With MacBook you can normally scroll horizontally as well as vertically by sliding two fingers on mouse pad. This works fine with all other programs, but with Vassal I can’t scroll screens but vertically. Horizontal scrolling simply doesn’t work.
I don’t really know if the problem is in Vassal itself, or in a mod. I’ve got no other mods needing sideways scrolling, so I haven’t experimented it yet.
I’m really hoping this could be fixed someday, as it’s frustrating to have to use the scroll bar always, when there could be also an easier way.