I try to use keyboard shortcuts whenever possible. Just seems to save time over navigating with a mouse.
I love being able to play a file with a simple 'Enter', but it'd be great if there was a hotkey for stopping the playback. If one exists, it's not obvious.
Similarly, hotkeys (perhaps some variation on alt+cursor keys) to seek/skip through the playback would be helpful as well.
Otherwise, keep up the good work! Just found this tool yesterday, and I already love it. It's now part of my tool collection!
- Ken