Phil added a link so you can block the category or programme you're looking at from within its own page rather than having to do it from the category / programme list. This does make Tank Top quite a bit easier to use.
And I've been writing a little bit of code (for the first time in years!) to add the ability to blocking and list by channel. We're being a bit cautious about deploying this feature as it's going to require a database change, and we don't want to break the live database - hopefully we will get the chance to test and roll out that update over the next few days.