Is there a way to add a new block to defense research tree

open player[...].entity, about the 600th line there is the "researchScreenData" modify the Defense / blockCount 1 for 2 and add that block, similar to the Combat/NonCombat!

Thats what i did but there is no other subtree under defense thats what i dont understand this is what i have in my player.entity

Defense
  blockCount 2
  block
   area [ 50 , 93 , 690 , 235 ]
   backdrop "ResearchScreenBlockBackdropCombat0Tech"
   tierIndicatorBackdrop "ResearchScreenBlockTierIndicatorCombat0Tech"
   title "IDSResearchScreenBlockTitleCombat0Tech"
   picture "ResearchScreenBlockPictureCombat0Tech"
  block
   area [ 50 , 338 , 690 , 235 ]
   backdrop "ResearchScreenBlockBackdropCombat0Tech"
   tierIndicatorBackdrop "ResearchScreenBlockTierIndicatorCombat0Tech"
   title "IDSResearchScreenBlockTitleCombat0Tech"
   picture "ResearchScreenBlockPictureCombat0Tech"

you did it corretly... and I tried it too... but it didn't work for me either

i have two ideas... 1: there is a hardcode limit, that you can change (10 blocks limit in researchScreen) or 2: there is a code that prevent the second block's loading in the Defense... maybe if you convert the ResearchScreen.window into txt, you can check that (I can't convert files from binary)

I think its not planed to get a second tree, so it seems that the only way is to expand the tree field.

I find similar cases, when there is place for new stuffs, but the engine not even bothers itself with the new command.  

I think so, the best way is to make larger the field.