skyboxes are broken in 1.3 update!

[Darkfire]

Don't add a different lamp to your mod unless you make a FC. People will have to replace the existing one, and this will change the lamp for every other story and the main game. So to play normally they'd have to place it back, and some won't save their files, complain that you broke their game.... Just make a FC or don't add the lamp at all.

EDIT: You said optional, but bear in mind that what I said still is valid.

PS. If you need any help on script, maps etc. just write it on the forum. You might want to use only a single thread, it will be more convenient.