Sort by Color Option in Annotations Pane
Many people use colours as a personal category system (e.g. words spoken by the Saviour are in red, missionary scriptures are green, personal scriptures are in Blue, etc.)
On the annotation page, if it was possible to filter annotations based on the colour of highlight / underline used, it could help people using this marking method to locate their personally selected scriptures.
Shawn Anderson commented
Also, those with learning disabilities (ADD/ADHD etc) are far more prone to use color to mentally categorize and find their thoughts.