Change bandwith monitor to Daily limit?

Hey

I just got my WNR3500L in the mail and am really happy with it. It has great features and customizability. The fact that it has a built in bandwith monitor also surpised me in a good way. It had the ability to limit the traffic to a certain value, but sadly this was based per month and could not be changed. I really need per day and not per month :(

I live in the student dorms and we have a 20gb up/down limit. Which means 20gb up and 20gb down are seperate limits. Is there a way to check the limit daily instead of monthly? I do not mind installing another firmware that has these features if neccessary