Sitting here thinking "gahh. It blows that I can't just pick two entries from my Thunderbird address book and consolidate them." when it occurred to me to make sure I was right about that. There is a plug in for that. Go figure.
Other things there are plugins for?
* Toggling word wrap (which dkg is sometimes on my case to do, and which you need if you're trying to send error messages to people who can help you decipher them.)
* Syncing .mab files (which is basically all I want from LDAP, and probably closer to the "right" way to go about it.) Or a variation on that theme.
* Managing identities better. Actually, there are a few addons for that one. One that seems like it might make me insane and one that looks about right.
I may or may not think to let you know if any of these work out for me.
Still on my wishlist? Thunderbird needs an offline state. I've moved to IMAP almost exclusively, which is working nicely in many ways, but which means that my drafts are always stored on the server. I want to be able to say to Thunderbird "I know that I am offline. Could you store my drafts in a local folder until I get back online (or forever)? That'd be swell, thanks."
View Addressbooks in Order