I would have a suggestion regarding the spell checker feature. It would be great if the
Firefox dictionaries could be used instead of the Addict component and dictionaries. There are less dictioaries available for Addict and as I see they are not really maintained.
Firefox, Thunderbird, OpenOffice.org, Google Chrome, Opera, and as I know even SDL Trados, use the open source
Hunspell, what is based on MySpell.
It would be probably good to check this.