There is no Folding full procedures and functions in packet. It will be useful for if you have formated code.
Folding comments, especially when commented big part of package body code.
May be custom Folding Names like /** My Area / , /* end my area */, you can see example from Microsoft VisualStudio…
Thanks for your suggestion, we have raised a story SQLNAV-1750 for you.
And we will implement it as feature.