we did not make any of these maps. but blinky and i plan to learn mapping because these maps are so damn much fun to play. they are different in design compared to almost all urban terror maps that are too open in their own way.
i did not exactly understand what you meant with dust and window script, but yeah, the wolves sounds suck ass, and there are some player clips needed so man cannot get onto the roofs.
what exactly you mean with ladders on train? and yeah, train also needs some clipping, being able to run around up top sucks hard.
to edit a map...
you need the .map (? iirc) file, but playable maps only have the compiled .bsp. so... to edit a finished map with out having the development files, you need to decompile it. but this leads to all the textures and all the lightning being lost. (again iirc) Means it will still be a LOT of work.
and you should have the permission to edit the map from the original author to start with, or what would you think if somebody takes your work and fucks around with it until it is quite different from you chose it to be?
i already try to find the guys that did these maps... though work i gotta admit, the train guy most certainly is not around anymore, and i am waiting for a response from the dust guy.
for making maps you use one of the versions of the Radiant, there is a link that may help here:
http://dejgaming.com/index.php?option=com_content&view=article&id=56:urtmappingstarttut&catid=35:mappingtuts&Itemid=67de_inferno, de_prodigy, de_rotterdam, cs_militia, cs_assault, cs_italy hmmmmmmmm