Add new scripts: Duplicate selection, Go to Next / Previous Paragraph
"Duplicate selection" duplicates the selected text at cursor point. This functionality is same as in VS Code among others.
Under menu: Scipts/Edititing, shortcut: Alt + Shift + d
Most common for this feature in other editors is Ctrl+D or Ctrl+Shift+D but they're used already.
Go to Next / Previous Paragraph: makes similar cursor movement as "{" and "}" commands in vi-mode / Vim. Small difference to vi-mode / Vim is that lines with only white space are also regarded as separators between paragraphs but it makes more sense IMO.
Under menu: Scripts / Navigation
Don't know what would be good default shortcuts for these so they don't have one for now.
I suggest placing these in this new "navigation.js" file if it's ok? These are placed in different sub-menu than scripts in utils.js and that file is about 750 lines already. There's two other scripts that already go under Navigation but they are in "jumpMatchingIndent.js".