When you click on a username you get this beautiful overlay with some information - also where he or she was seen last. I would appreciate a short link "refresh" for requesting the last known location of this user again and again. :)
We reached a social media era and therefore it is worth asking for a possibility to let the user notify not only via mail. If XenForo is configured correctly you can provide the user a notification via Twitter DM or a Facebook message.
I guess lot of people would use that feature.
When I get an alert of new posts in watched thread I would prefer it if the alert disappears automatically when I visit this thread and I do not have to click it away.
There is one thing in forums that is annoying me when using mail notifications: When I turn on mail notifications and I am in the forum I can see that there is a new post on a watched thread for example. Therefore I do not need another mail. From my point of view that is going to be spam mail...
Could you please stop spamming this thread? You can discuss that with him per mail or private message or somewhat.
This thread si dedicated to the german language pack.