Possibility to send email on highlight/query
For IRSSI (-proxy) there is a nice plugin, which allows you to receive highlights/queries via email, when you are disconnected. I liked this feature quite much, since it gives you a good overview after longer absense and allows you to instantly see important messages, even if you don't want to be available directly via IRC.
I'd suggest to add such a feature to the quasselcore, too. It should send all queries and highlights to a configurable email address (using a configurable SMTP). Since queries mostly consist of several lines, it is wise to collect queries and highlights for some time (maybe 3-5 seconds, configurable would be nice). For highlights, a context of some lines around the highlight would also be nice (e.g. 3 lines before and after the highlight).