Thanks for your feedback! The lap option is a good idea. Although you can achieve the same effect currently by clicking the start/stop button twice. I'll definitely add the ability to start with enter. The heaviness is a side effect of turning a python program into an executable (and having to bundle python with it), and I don't think I can fix that directly, but I may look into turning it into a python package that other python users can easily install.
Glad you found it useful!