Is there a way to avoid to push in background bfgminer output better then modify and compiling the source?
I had a look at source code and your comment about the hashrate improvement but I'd like to have the possibility to enable "-q" option by using it or not in the string for miner configuration (or better in the GUI as a tick

)
The -q argument is already used - nothing more for you to do here. And it really only affects super slow machines - think Raspberry Pi. I just put it in there to be thorough.