The reason I do this is to have an easy manageable module that is used like a library without 20 and more files (like a precompiled library in C) but I see that this was not the idea of the vqm files.
Another point is that there are bdfs in the designs that can't be included into a SOPC module. Using the vqm seemed to solve that problem... (of course I could also convert them into verlilog/vhdl, but this is a huge work because the conversion by Quartus don't produce really usable code - hmmm just tried it again, 7.2sp1 may come over with that problem )
So it may be easier to use the source files as they are even the file list of a SOPC project will be long...
The point to integrate the parameters into a vqm file is not usable because I have e.g. array size parameters that are odd to replace in a vqm file.
Thank you for your answers.