I like the messages UI of empathy but still prefer the flexibility of pidgin. So, I used this tutorial to install pidgin webkit plugin with tiny modifications that make it even easier.
This plugin make pidgin able to use adium styles (not all will work though).
Here is how I proceeded :
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Assuming you can’t configure your apache server to use hg fast cgi script, or you don’t have apache, here is another solution :
using hg—serve with nginx as proxy for authentication