I am all for adding options to ignore topics, maybe
PowerGlove can again perform some of his script magic for another forum update

I expect it from PowerGlove who is genius with code and SMF patch.
The ignore thread button would better fiT close to the quote button in the Op for visibility or just a drop-button on the existing one.
Sorry but I fail to see how a drop-down list/ menu can bring more convenience. It is convenience wherever it is located especially if we can assign specific button / space for each one.
Let's imagine that I want to be active in Meta but I don't want to see the above threads or some other ones I don't think are interesting to me personally. However, it makes no sense to me to ignore the users who created those discussions because I have nothing against them and I might enjoy there other discussions.
It makes a lot of sense. Ignore a person is too serious but it's right to ignore specific uninteresting topics / posts from that person (especially topics).