I find it useful to be able to know a sorted list of all manga suggested in the thread. When replies grow, it's better to just take the top few suggestions and google instead.

• Since there's already some integration to internal MU list, everytime a user replied and used the manga tag in his reply, that manga should be up-voted once or added to the list.
• The list of suggestions can be rendered like the poll thread type.
• Ignore double suggestions from the same user. Ignore suggestions in quotes.
• Ability to simply upvote what's already suggested like in polls. This helps keep the noise level down by pruning "me too" replys.

notes:

• This also works roughly for existing threads, since only one time db scan is needed to populate the initial list.
• I have a feeling that the current recommendation system somehow make use of the manga tag, if not this data can be used to improve the recommendation or used for exploring genres one is not familiar with.
• In brief,I want to quickly know "A list of all mangas mentioned in this thread with corresponding weights".