[Zubersoft]

You can already create bookmarks to jump to a specific page, and all of these bookmarks show up in the bookmarks window. You can set up a touch action to show the bookmark window. There isn't an option to create a bookmark with a two or three finger tap though, but that could certainly be added. You could try this out though - use the two or three finger tap to bring up the window, tap the + icon to create a bookmark and then close the window. Does that function as a workaround for the time being? Does that get you what you need? Or are you needing to add a lot more notes than just the name of a bookmark? You mentioned the forScore bookmarking feature which does not support the same idea as a sticky note, so I'm just trying to make sure I understand exactly what you need. 

Thanks,
Mike