Editing in Final Cut Pro X is faster than just about any other NLE on the market. It has gained a very solid reputation for giving editors the tools for fast turnarounds using its surface level features. In this tutorial I’m going to cover some tricks that will help you trim your edits ever faster, with more precision, and have a lot of fun on the way.
http://www.macprovideo.com/hub/final-cut/final-cut-pro-x-speed-trimming-techniques

Thanks Ben. I found that useful. I do wish I could see the outgoing and incoming clip without being forced to use the mouse, though. That would make it even better.

Yeah, I personally think that once you hit [ or ] or \ to activate a trim operation from the keyboard the two-up trim display should activate, too. I've filled out the feedback form. Hoping more do the same. I use to miss the Trim Edit window in legacy.