Control Data Speed on Android (GPRS)

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http://forum.xda-developers.com – Hi Team, Is there any way we can control the speed of GPRS Data Speed , let say some 2kbps like that ? I know its funny as GPRS itself is slow and why am i wanted to reduce its speed even lower. I got some idea in my mind to reduce battery drain. Using Tasker I have achieved to control per application 3G Mode (WCDMA only) when they are active, and rest all the time phone will be 2G Mode(GSM Only)(mainly when phone is in locked state). I know the chat application would do background connect and prob for new data, at this time, if I can control the data flowto its minimum, I feel it will (HowTos)