Hmm interesting, yeah I think I messed up on the link guys my bad Ollydbg didn't save modifications for some reason, I have been messing with it more lately, even forcing the LOD extremely high, hasn't made a difference, can this tessellation cap be modified or is it a physical limit?
I was messing around with the game today and figured out how to remove the LOD_RADIUS limit, you can now go to whatever value you like, I left 2.5 as the lowest value and there is no ceiling.
Instructions
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1. Backup terrain.dll in root P3D folder
2. Overwrite with provided terrain.dll
3. Edit Prepar3d.cfg (LOD_RAIDUS) and open game, as soon as you adjust in-game it will go back down like in FSX
Download : http://filebeam.com/c92dfca33fffae56c711c56c2b3c49f6