sauerbraten engine?
The Sauerbraten engine may look impressive, but it is so riddled with bugs and inaccuracies that it is hardly realistic for an online game.
Simply, there is not a viable engine to switch to right now. XReal is unstable(as far as I know), and there haven't been any milestone ioquake releases. If anyone can correct me on this, that would be exciting.

As many others have said, I really agree that the main client download should be replaced with a newer one, with downloads on by default, etc.
I almost gave up on this game because of the empty server list issue, and I'm sure many have already. Combining the un-boxed sorting system with showing a server list without changing source would make the game more accessible for newbies.
I hope the devs really
listen to the community about this, as regular updates, even if not giant, would allow us to spread the word around again.
Thanks for your time,
Whales