Share free billing quota over all API

[Kroc]

Hi GAE developpers and sorry if I miss a similar thread.

I'm using GAE for my hobbie, an open source application. Application is running under all free quota except one: Channel API...
I'm going to pays the 9$/month for 200 opened channels a days.

So, my request is very simple: could you share the free quota over all API ? Or can we tuned the free quota ?

Did you planed different billing policy for open source and not commercial application ?

Finally, are the minimum spend per month still be present in our balance if not used ? just in case our site become famous ;)