How to increase objects self shadowing distance LoD?

Hi, there is something that drives me crazy since very long ago...when you use F3 view or an external view or when you are in a dogfight and zoom in, just a few meters away, all objects and particulary PLANES, lost their self shadowing:

with shadows

without shadows

....the problem is this happens waaay too close to the camera which is very distracting and makes odd things like shines where there shouldn't be any, increases difficulty to "understand" how the other plane is posed, etc. So I wonder if someone knows how to increase this parameter/s, if possible for both 1.5 and 2.1 versions.

I have tried with many lua's and cfg's but couldnt manage to change it one bit so maybe someone with more knowledge can help me or give me any hint of where to look for it.

thanks a lot!!

Anyone??, maybe a hint of where to look??

thanks!!