1) Make annotations sortable 2) Have pen toggle btwn two colors
1) Make annotation sortable like folders in the navigation column oin File Explorer -- which makes the annotations your own Custom Index. If you can make, sub-annotations -- just like an Index
2) Make the pen with default color -- or a toggle btwn two colors. Typically I underline new words in blue and important staff in red. Most of the time I need red, set as default, then on occasion I need the blue for new technical word or concept.
Zaw Moe Lwin commented
My shortcut is just make an annotation and press on it, change style, the new style has become the default.