Yes, we desperately need an add to dictionary option. Also an 'ignore all' option. The proofreader is telling me (wrongly) that I need a space between the full stop and the closing speech mark, and I have no way to ignore this.

I'd like to add this issue: double clicking on a word summons the synonyms popup, which is great. But some words are hyphenated, or idioms. And double clicking will select only one of the words, making the synonyms popup display wrong or incomplete suggestions.
It would be so cool to have a key combination or a button in the contextual toolbar to summon the popup over selected "text" vs "word"