Heute gibt es ein Mini-AppleScript für Things, dass einer Auswahl von Todos Tags hinzufügt.

tell application "Things"
set myTags to text returned of (display dialog "Enter some tags you want to add to your todos (comma sep)" default answer "")
tell application "Things"
repeat with selectedToDo in selected to dos
set tag names of selectedToDo to (myTags & ",") & tag names of selectedToDo
end repeat
end tell
end tell