Finale adds one or two extra links to its arpeggio signs, so that I am constantly adjusting their length. If they were one link shorter by default, the majority would be correct. And while I am now happy with my horizontal position settings for these signs, they still run into accidentals even though collision avoidance for articulations is checked. These issues are shown here:
The best solution would be an arpeggio sign designer box where users could specify the general length they prefer. And for collision avoidance to work for arpeggio signs.
Finale 2014.5 on OS 10.8.5