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I think it would be a good idea to make the ability to use bookmarks more prominent. It their current state, you can pretty much only discover them by accident. In the manual, the only place they are mentioned is in the keyboard shortcuts page. In the IDE, there is no button or drop down option whatsoever for setting bookmarks.
I would recommend adding a bookmark drop down menu on the menu bar at the top of the window, and also allow setting bookmarks from the right-click menu on a line of code.