[texhax] Biblatex: cite title: subtitle

[Joel C. Salomon]

Is there a veariant or relative of \citetitle that will list
	title = "Optimal Control Theory",
	subtitle = "An Introduction",
as /Optimal Control Theory: An Introduction/, or do I need to include
the subtitle in the title to do that?

I already know I’ll need to \renewcommand{\subtitlepunct}{: }.

—Joel Salomon