[shock]

If most users had your attitude we would have far fewer open source/free softwares. The author has already spent a significant amount of time making the tool, criticizing him for not spending more time/energy for something that can easily be done by the reporter seems, well, counter-productive.

In most cases, feedback is not worth much, depending on your goal. E.g.: I've made some software that satisfies my requirements. Should I be grateful for feedback that, in essence, requires more free work from me? What's the thinking here?

For these reasons I consider the author's attitude most appropriate, considering he could have said "the software is free, send a patch", or just "works for me, take a walk – I don't owe you anything".