When researching keywords in Keyword Research Central, we noticed that you couldn't actually add your researched keyword to Keyword Manager. Instead, you would have to copy it down, leave the tool, go into Keyword Manager, and add it there.
We've made that experience much, much better.
Now, fixed rows in the Search Volume tool are just as functional as the data that follows them. You can add keywords to Keyword Manager via the gear menu and research that phrase further. In addition to those changes, you can now search and filter these results.