[chrisbartley]

Right, I figure the code is indeed still in there since the same version of OmniFocus on Snow Leopard has the separators. I just hoped that maybe a custom, no-op toolbar item that just happens to look like a separator could be added...

Hmmm...I could probably hack this myself by creating a perspective and just setting the icon to look like a separator. :-)

...or I'll just give in to Apple and get used to only using spacers.