Just remember when replying that we can only have influence on Flexcoin ... not the download client or the bitcoin system itself.. just try to keep it in that reference ..
Sorry, if it sounded too generic. When I referred to Payment Processor I meant FlexCoin. Since you hold both payer and payee accounts and you process the transaction you have full control over its reversal. Just don't monopolize arbitration.
It could work something like this:
1. Some of your customers designate themselves as an 'arbiter'.
2. When making or requesting payment one can add a stipulation - this payment is bound by the terms this agreement (text and hash of agreement) and the arbiter is
3. If there is a dispute later, arbiter is notified, makes his decision and instructs flexcoin to (not to ) reverse this transaction.
If I'm understanding it correctly this does not require any influence on bitcoin system itself.