+1!!
I personally used many times FX library function on old editor. But I thing another feature that can be really helpfully: Something like the "Combinator" of PropellerHead's Reason 4.
Basically, it's a "patch in the patch". It's permit to save a combination of some fx/synth, and then recall it into a project. May be it's not doable, but I'd love it if possible. Imagine, you have a patch w/ your favorite lead ton, and you saved some "combis" for emulate a NI B4 rotary, a "Map Of Problematique-like" sequenced pitch/filter, or a wonderfull many blocks tape echo emulation. Now, you just have to load the desired combi into your actual patch!!!
How many hours of programming do you thing you'll save?