Please add some simple/quick keyboard shortcuts for different colors for highlights. It would be quite a big quality-of-life over just pressing for one color (yellow). Or a hover menu for annotation colors if possible like other PDF readers.

Why not integrate the Annotations window similar to how Bookmarks are integrated? Having Annotations open in a separate window is inconvenient. I usually place it right next to the PDF body anyway.

Additionally, I have a more specific proposal that could significantly enhance the user experience. Allowing users to save their color settings would be a game-changer. It's currently inconvenient to keep switching between color settings for annotations. By enabling the storage of user settings—such as ten favorite colors—you could greatly improve usability. Essentially, there are two parameters to store: color name and opacity setting. Please see the attached screenshot for a visual proposal. (P.S.: Sumatra is fantastic, and the developers are doing an excellent job! My utmost respect and support go out to their work.)

Inserting image annotions would be great, when you are required to "sign" the document

Yes, It would be handy for me to quickly add green check marks, red cross marks and yellow attention !-sign marks with just some right clicks.

As a further addition, semaphore-colored square boxes to highlight an area, instead of text, would be used with the same goal.

This application is currently a lightweight PDF reader that consumes minimal memory and responds quickly. However, I would like to enhance its functionality to include quick annotation capabilities with features. By incorporating these additions, SumatraPDF will transform into an ideal PDF reader for individuals who frequently work with PDFs. Though I have discovered it in the command palette, it is not functioning yet. I eagerly anticipate the implementation of this functionality.

Better Free-text. Boxes need to be resizable and a more intuitive editing would really help. Foxit free-text resizing is now broken, and current Sumatra feels even more awkward.

Also, area highlight (like Foxit, but movable); it's much more versatile and looks better than line highlights.

As mentioned elsewhere, signature stamps (not cryptographic signatures) is a major time saver and recently got nerfed in Foxit as well.

There is an issue when visualizing the annotations, sometimes the boxes entities overlap each other making hard to see what comment correspond to another.

Please consider double click edit the annotation.

And way to save annotation templates.

it would be great if I could save the config for free text annotations like color, font, etc !! and be able to make text annotations without having to exit fullscreen