I played around with creating a chain, with transaction fees etc, but the fees varied when transactions were made, and it is not quite what I wanted to do anyway...I think it would be a lot easier to do it with assets, set up as a kind of subscription model.
I read you are planning to implement transaction filters, do you think it is possible to use that to enforce some rules? ie: if transaction does not have an amount of X to be sent to a particular address, then transaction cannot be sent?.. or do I have the wrong idea about filters...