http://0x80.org/blog/?p=145
Check this blog post I've patched r8187 drivers code to do cool things

$$iwpriv$$
highpower : ** user it on your own it might destroy your device **
activescan : if 0 the driver will avoid to send probe requests, sanning will be only on beacon basis
badcrc : let you choose to kill or to pass to the upper layer frames with bad crc in monitor mode and fasttx

the sourcecode can be downloaded from http://0x80.org/code/drivers/rtl8187...22.2006.tar.gz
it