It kind of makes sense. It makes the timing more accurate by preventing late starts caused by different people starting typing at different times.

Just make it start counting at the first matching keypress. Problem solved.

We will be adding an Options panel soon, and we'll make it possible to opt for this. Thanks!

Still very much the wrong approach. I can see why you had the demo-mode on the landing page, although I think it isn't necessary, but there's really no reason to have it all once you're interacting with the site.

Another side effect is that sometimes I accidentally skip sentences that start with s because i invariably forget to press enter before starting.

I also did this several times initially.

Smart defaults. Requiring enter to start is not smart. It just isn't. Sorry.

You can have a big start-typing button at the home page (initially). But when we select a lesson from the select box or retrying a lesson, it would be great if we could able to start typing immediately.