Rated 4 out of 5 stars

Hey, could you provide an update for thunderbird 3? I would greatly appreciate that.

This review is for a previous version of the add-on (0.2.1). 

I guess you mean Thunderbird 2.x. Unfortunately, the answer is no. There is no way to do that with Thunderbird 2 (really, no way). I would have to create a completely different extension which I do not plan to do :). And basically, that extension would be Thunderbird 3...