Prevent looking for similar topic in some categories / prevent including some categories in similar topics?

[Canapin (Coin-coin le Canapin)]

Hi.
On my forum, I have a “welcome” subcategory. People come here to introduce themselves.

When I start a new topic, results from this subcategory pop up on “similar topics”. This has no point. Can I prevent this category to be included in the similar topics?

Plus, is it possible to disable “similar topics” when posting in some categories?

[codinghorror (Jeff Atwood)]

There is a site setting to limit suggestions to the current category (of the topic you are currently reading).

[Canapin (Coin-coin le Canapin)]

Aaah, yes, I missed this one, thanks.