JSF and close air support

Everything I read seems to indicate the JSF is intended to do air to ground
work primarily with high-tech weapons like JDAM bombs. However, I get the
impression that such weapons require a considerable amount of advance planning.
This would seem to make loitering near a combat area waiting for a call for
support if and when the need arrises more or less impossible, in turn making
this combination of weapon and aircraft useless for that sort of work. Perhaps
this is not overly relevant when engaged in wholesale warfare, with hordes of
Apaches to take care of targets of opportunity/necessaty (SP?), but how much of
a problem would it present in a small scale bush fire war? Is my idea of CAS
totally outdated? Or am I mistaken about the capabilities of weapons like JDAM?
How effective is a JSF with dumb bombs, or LGBs, or, for example, AGM65
missiles?

Rob