Good idea in general. But I don't really think it's needed. There are so many scripted, weaponmodded, climbing, ect. servers so if I want to play some ctf-match for example I usually only have at least 5 servers to choose from which have a ping <100. And since I don't want to waste my time on >12 slot servers I only choose the <10 ones.
But yeah, it won't hurt anybody and isn't hard to implement imo, so a *thumb-up* from here.