As I already mentioned before, one thing that annoys me a bit is the fact that Bat first pretends to rememeber freshly used email addresses and completes them for few days (quite confusing) and then suddenly stops remembering them. You have to look for them and manually store them in the address book. Yet, even after that it does not work immediately, only after restarting Bat.
I would definitely like if Bat has a simple and quite essential option and function (as you find in other email clients) - "save automatically email addresses from received and sent emails to the address book". Not everybody wants to bother to specifically store each address manually ...
I am sure it is very easy function. So, please ...