Replacing trees with dead trees? And possible trick for performance?

[Ceeo]

Sup guys. Could anybody tell me how i would go about replacing all trees added by this modhttp://www.nexusmods.com/skyrim/mods/22733/?with dead trees?

 

Or maybe how would I go about adding dead trees and ruins to Skyrim using the creation kit?

 

One last question: Will it be possible to replace the lods with the lowres lods from Skyrim Ultra Low Graphics, then covering them up with fog in game so that you wont be able to see them for a performance boost?