Whatever your opinions of RA3 might be, they did use an excellent server-structure. If you somehow don't know what i'm talking about, they used a setup where there was a team-arena and several duel arenas, all happening at the same time, on the same server. You could switch between the team arena and the duel arenas at your leisure.

Why don't we implement the same system in QL, but with TDM and duel? The setup is great, in that it attracts lots of players to the servers, and makes it easy to find games to play (whether duel or team). I don't know how expensive it would be in terms of programming, but it would definitely be an improved and technically doable modification.