Thanks a lot fot the info! :)
I already read about MIR and it seems to be an interesting approach, that I will definitely take a deeper look into when it finally becomes available. Anyway, I don't think that it's only a matter of purchasing the right tools, because - like you said - it's all possible already with lots of manual tweaking.
The reason I started this thread is to find out about how people approach the problem using traditional tools like EQing, compression, etc.
So for example, I found out that rolling off high frequencies in an instrument, also helps a lot with putting it further to the back of the virtual space. But on the other this method seems to make the evaluation of the exact stereo location harder, which results in a less defined stereo field.
All the best
Heiko