rightmindedness

I've been wanting to hack my GH2 for a long time now. My problem is, I shoot three-hour videos with this camera on a 32G SD Card. I'm afraid that I will go over my card limit using 44Mbps. If I install these patches, is there an easy way to lower the bit rate in case a three-hour video shoot is just to much data to fit on one card?  I can't swap cards in the middle of the shoot. I would like to be able to play with the patches in my personal time and yet when shooting three-hour videos for work, use a lower bit rate to get it all on one card.  Is it easy to flop back and forth between 24Mbps and 44Mbps using these patches? I'm just not sure how it all works. Thank you.