I think a much better way would be to just post a public email address for reporting bugs. That's what I'm doing for my (closed source) apps, and it works extremely well.

Even people with limited computer skills know how to use email. This ensures you get the maximum number of bug reports.

When you personally reply to emails (no automatic responses), people are extremely helpful. When I can't immediately reproduce a bug that a customer reported, I ask them a series of questions, and they almost always respond quickly. If you send clear instructions, you will get useful information even from people who have no clue what they are doing.

If you force people to fill out a lot of unnecessary info beforehand, you'll get less bug reports. If you send them automatic replies, they wont respond.