You should run a half percent full percent commision for your nvOC. Every other man and his dog takes a cut dor their hard work and you provide better customer service support than most very expensive software packages!
That has been suggested before, but as fullzero explained he wants to have it further developed (easy update, remote management) before taking donations. But IMHO it's quite simple to send some appreciation: keep the CPUminer on the default account, and/or mine a couple of hours on his accounts with your rig.
Eventually I might make other software or offer a service I would charge for; but nvOC and the amdOC version with related apps / ect will always be free.