Good idea, but a glitch with the TAB key Rated 3 out of 5 stars

I'm using the tab key to leave the subject field and enter into the body field. Problem is, when I do that, the first entry in the subject history is selected and replaces the whole subject I just entered manually.
Also, I don"t get how AUTOcompletion works here, as all the previous entries are displayed in the list... I thought it would take the letter I'm typing into account... Maybe I'm using a wrong setting (the default ones for the moment)

This review is for a previous version of the add-on (0.0.3).