Why does function lack a simple release?

I am using the function as an envelope to an audio signal. However, if I make a complex envelope with many breakpoints, and then, say, turn several of these into sustain points, I don't quite understand why there isn't a simple "jump to first non-sustain point after last sustain point" command.

I just want the function generator to jump to this first non-sustain point when I release the key on my MIDI keyboard, but this doesn't seem possible in an easy manner.

Are there other, alternative (yet still simple) ways to do this? Other 3rd party objects that might do the trick?

Any hints appreciated.