THINKING CLOCK: Good idea, the beep should be changeble because it is not very noisy, and I have barely heard it, or not at all. Perhaps an option with a small pop up.
I had used another pommodoro clocks, with more options, but this is a good idea to start.
It would be great to integrate it with thinking rock, and to put on a chronometer to see how many time a task has taken. It would be also useful even two chronometers so if when you were counting down an action, another task breaks in, (for example a telephone call) and the firs could pause and the second starts until the phone is end, and when you stop the second the first starts again, so to register all the events.
This is related to the suggestion of adding a tool to track the time that take the actions in TR.