> * Toggling if search results should be highlighted (:set hls, :set nohls)

After you search, you get persistent highlighting. To turn it off, "SPC s c". All the toggling features are in "SPC t" group.

> * Opening the filename under the cursor in a new window (^W f)

`SPC f h` then press `C-c o`. The key bindings are consistent in other Helm commands as well. It opens a window side by side. Nothing is misisng, sorry. Spacemacs can even do things like [these](http://tuhdo.github.io/helm-projectile.html).

If you have any question, ask it on Spacemacs chatroom: https://gitter.im/syl20bnr/spacemacs