I agree 100%. However, I may have a work-around for you. You can download a free program called "Polyphone". Polyphone is used to create SF2 soundfonts, which do work in the new version of Presence. You can open your SFZ files with Polyphone, and simply save as SF2. Check it out here: http://www.polyphone.fr/index.php?lang=en&page=features
I have done this successfully a few times: I created a drum kit with the free "SfZed" program: Creating a brand new instrument is easier to do with SFZed than it is with Polyphone. However, once created, you can open the instrument with Polyphone, and tweak the instrument in any way that you like. *It seems to me that the Sf2 format will do everything that SFZed will do....and more.
Good luck! I'm hoping this works for you!