i just made a bug report regarding the search engines feature, so while it's still on my mind i figured i'd request this. there should be a way to edit or disable the preset search engines like you can with the custom ones

that hyperlink also doesn't work apparently but you can paste this into the url bar opera://settings/keyboardShortcuts

@bloor88 if you're used to different keyboard shortcuts than the defaults, you can change them in settings > shortcuts (at the very bottom under advanced) > configure shortcuts (or click this link)
as for why the forward mouse button doesn't work, i have no idea and am also annoyed by it

@daymi4n: didn't know chrome extensions work on opera. thanks!

It'd be nice to have a way to save settings or adjust how long the pauses between sentences are, but this is still the best tts extension on opera i've seen yet