[Usability] Modifiers + Scroll => Zoom, which modifiers to use?

[Christian Neumair <chris gnome-de org>]

Bug 79352 [1] suggested that "shift-mousewheel could zoom in / out on
nautilus views", which sounded like a good idea. Now that Nautilus HEAD
zooms the current directory view when the user presses shift+zoom, Mike
Miller suggested [2] to use the ctrl key as zoom-triggering scroll
modifier, since other applications (many win apps, probably firefox or
mozilla) have this binding. Also note that currently, Epiphany has ctrl
+scroll bound to quick scroll (double-stepped).

Windows(/FF [probably]):
ctrl+scroll: zoom

GIMP, Nautilus:
shift+scroll: zoom

we have to decide whether consistency with win is important here, or
whether double-stepped scrolling should be bound to ctrl.
Any opinions?

[1] http://bugzilla.gnome.org/show_bug.cgi?id=79352
[2] http://bugzilla.gnome.org/show_bug.cgi?id=79352#c8

-- 
Christian Neumair <chris gnome-de org>