Hey,
I made this tiny change for you. You can grab the Windows executable and the source...
http://members.iinet.net.au/~hanjohn/te … %20src.rar
http://members.iinet.net.au/~hanjohn/te … winexe.rar
More detailed instructions are in the readme in the rar... But all you need to do is extract the .exe to your Teeworlds folder and run it. There is no interface for it, yet. But it works perfectly fine.
You need to change the variable "b_filter_min" in the console to what you like, such as 4. By default it is 1.
So from now on it will filter out all servers with less than b_filter_min players.
Tick and untick "Has people playing" to refilter the server list if you have changed the variable "b_filter_min".
If you're not running Windows, then you will have to compile it yourself, sorry.
Reply if you need help.