i hope research is not done so "systematically" like that in HOI2,
i think...
a nation's research power should be determined by 2 factors.
1. Theory (say, scientists)
2. Industrial Strength (this is obvious)
Theory:
this factor should be determined by the number of research instituted, such as universities and scientists... this factor should be to determine whether a nation could have some technology breakthrough easily,
such as , the invention of Strategic Rockets, Jet fighters, Atomic research ... i am sure that no matter how hard Nepal try she could never have some progress in thinking about a jet plane.
Industrial Power:
it's very obvious that Industrial Power affects research a lot, such as the research of Atomic Bombs, Rockets, or Maus Heavy Tank... One might have some drawings of very advanced stuffs but he could never produce one to test it...
to prevent tech rush, we should abandon the selection to research discrete tech items, say, one should give orders to his Nation's research institute to research, tanks... artillery...