I accidentally discovered a rather odd way to open menus using only the trackpad in Leopard -- even if you haven't enabled trackpad tapping. If you position the pointer over a menu entry on the left side of the menu bar (not a menu extra), then quickly do a two-finger scroll and tap on the trackpad, the menu under the pointer should open as if you had trackpad clicking enabled.[robg adds: A comment on the queue review site notes he had to "two-finger scroll, then tap with two fingers, and then slide my finger down normally. Feels like a bug." I haven't tested it myself.]

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