Alt-M Q G brings up a dialog letting you select a patch to apply up to. But in order to actually navigate the list using the keyboard, you need to TAB into it, or press Alt-P (and then Down at least once to select something).
The dialog should rather initially focus the list, probably preselecting the first patch (if any).
Integrated into 'main-golden', will be available in build *201203170400* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress)
User: Ondrej Vrabec <firstname.lastname@example.org>
Log: #209543 - Go to Patch dialog does not place initial focus sensibly