Arpeggio speed

When entering an ornamental arpeggio (the wavy vertical line), it plays back nicely, in most cases. However, I tend to find the arpeggiation speed a bit fast to my liking. A more relaxed and drawn-out arpeggiation would be more appropriate to my style. Other than manually altering the note lengths and positions in the Play area, is there a way to alter the arpeggio speed?

Yes, in Playback Options—Timing—Arpeggio Signs. Ctrl (or Cmd)-Shift-P