Freedom of the Will<i>. In </i>The Works of Jonathan Edwards
Well, the real fix would be to get rid of the visible markup—which works because the citation processor supports it, not Zotero itself—and just use a stripped down rich-text interface for titles. People shouldn't have to enter HTML themselves.
It would use keyboard shortcuts, as Rintze says, which are more discoverable and user-friendly than markup.
I find markup easier to remember than funky keyboard shortcuts.