e.g. in the server browser, showing the address of the server somewhere [..]
INET6_ADDRSTRLEN is 46 chars, where'd you put that? Granted, you can write 2001:0db8:85a3:0000:0000:8a2e:0370:7334 as 2001:db8:85a3::8a2e:370:7334, but that's still a lot.
A simple way could be to show a dedicated "status line-like" for the currently highlighted server.
Other, more complex ways could include implementing left/right scrolling tables, or popup windows when mouse-overing, or tables with selectable (or expandable) fields, or a "server details" button that would give more infos about the highlighted server (ip address plus serverinfos, maybe) -a single button for the highlighted one or a clickable icon next to each line of the servers table?- or maybe something else that I can't imagine right now...
I suppose the "status line" or the "server details" button could be affordable solutions. Anything would be surely better than nothing!
PS: Until current problems with IPv6 & Dpmaster will be solved, I suppose IPv6 will not be used a lot... However it's right to consider it... I hope OA3 will solve those problems.
EDIT: I thought about it again. I really think that both "address line" and "server info/server details" button would be possible and useful. I think both features could even co-exist.
The server info button could bring to a very simple screen writing the output of the server info command to the screen instead of to the console. Q3/OA already has something similar, accessible from the "ESC" menu after you joined the server: I suppose we could make that page accessible from the server browser... and obviously we should fix the current great limit of that page (IIRC, at the moment the number of lines shown is not enough to display all server infos, and unfortunately it is not possible to scroll the page. Giving scrolling command to that page would be good.).