Cross Staff Arpeggio doesn't work

There's currently no way to make an arpeggio marking fill the space between 2 staves. Currently they appear broken, with one arpeggio on one staff and another arpeggio on the notes of the other, even if the "move note to other staff" feature is used. This is misleading. If there is one arpeggio line flowing across both staves, it suggests one consecutive arpeggio broken between the hands. If there are two separate ones it suggests two separate arpeggios to be happening simultaniously (for instance, if both staves had a C major triad an octave apart, the first approach would suggest the arpeggio to be C E G C E G, whereas the second would suggest C E G to be played only once, in octaves.) Currently the first approach is impossible to notate, despite it being the more often intended one.