[NTG-context] \setupitemize[packed,paragraph]

Why does \setupitemize[packed,paragraph] ignore the "packed" option? Another way would probably be to say \setupitemize[packed,joinedup], but I would only like some additional space after the itemization and none before. \setupitemize[joinedup] produces the same result as \setupitemize[packed,joinedup], which I also don't really understand. Is there a way to specify how "packed" two items are? There is a "packed" and "unpacked" option, but when I'm working with huge fonts (on slides for example), it would be nice to be able to specify some fraction of "how well packed" two succesive items are. Thank you, Mojca