Could you add a "Vector altitude" window under the STAR's Active section?
Basically if you had STAR's Active selected and an altitude set in the window PFE would begin to vector you to final once you descend below that altitude.
Lastly i'm having a slight issue with requesting higher or lower altitudes. Everytime i hold H or L and then select 2, 3,4 etc. PFE will first give me instructions for the actual keypress and then issue me a higher or lower altitude!

Regards
KLC