I asked you if the plugin had the ability to apply tags & prefix to threads filtered with a search. You answered yes.
For example: create tag "sport" -> search "swimming" in the title -> apply the tag if you find it.
This process is not effective because the plugin extends search to the whole discussion even if it is set search only on the title, as also @eGullet says.
So there are too many false positives, like discussion with title "Today it rains a lot" which contains a post "it's raining so much that I'll go to the office by swimming".
I hope I was clear.