What about having an option to mark topic as solved.
Better than tag because very visible on the first post of the topic

hello, 

i think there is a bug with corejoomlaquiz 4-5-2

1-with Corejoomlaquiz - 4-5-2, i cannot delete questions,

2-i have unistalled it and put Corejoomlaquiz 4-5-1 and i can delete questions.