[ralferoo]

Doesn't work for me (in Chrome for Windows) as middle mouse toggles mouse scroll mode. Although to be fair, even if it did work, I'd never have thought to try middle mouse! If you added a button at the start of each line / paragraph, it'd be obvious the functionality exists as well as not relying on extra mouse buttons.

[ItalianPoetry]

I'll admit it's not an obvious choice at all, but it's documented in the Guide ;)

Your idea is worth considering, but since it's at a lower granularity, I'll try and see if I there's a better way to trigger the word-level feature.