I think editable stamps would be great, especially customizable ones with different faces, and be able to change the colors, also be able to add your own like Great Job, or Nice work, etc.

This would be awesome! Custom stamps or stamps from the app-store similar to sticker packages.

I'd like a custom stamp that I could use to annotate notes and/or note pages, such as a stamp that contains a write-in field for Date, page #, etc. This would be useful for cases where I want to reuse existing templates (e.g. squared paper) without having to recreate the entire template from scratch.

Noteshelf features this. I used a √ stamp to indicate individual page sync to Evernote. Can easily see status in multi-page view.

Please add the Feature.

I completely agree with the idea of a standard set of symbols (arrows, x's, check marks, etc.), in addition to the ability to create a custom stamp.

1. Time stamp would be great

Custom stamps, too, please! I use GoodNotes to annotate sheet music, and I'd love to upload a variety of custom symbols (with transparent backgrounds) to use with a Stamp feature.

Fantastic app!

And since GoodNotes are vector files (so awesome!), give the app the ability to accept custom vector stamps such as transparent PDFs.