Hey deathknife, this is a sweet plugin, I remember using one similar years ago back in 1.6 and everyone loved it.
A couple questions, does this apply your selected skybox to every map, or only for whatever map you chose a skybox on?
Also, is it possible to add a "reset sky" option back to the map default? This would be especially helpful for maps that have custom skyboxes packed in with the bsp, that wouldn't be selectable.
It applies your selected skybox to every map. There already is "Map Default" at #1 which just sends the server's sv_skyname to the client.