I would love to hear your questions, comments, criticisms, creative ideas, and ideas for helping out. Don't be shy -- send your thoughts! Feedback from interesting people is essential to keeping any community project thriving and improving. Please try to be concise.
There are several places you can send feedback:
User mailing list: This is the place to send support requests (e.g. "How do I do X?" or "I think Y is broken; am I using it right?"). It's also a good place to discuss techniques and strategies for using Macker, and ideas for new functionality.
Developer mailing list: This list is for discussion of implementation issues among developers. While it's public and you're welcome to listen in, please don't post unless you are discussing implementation / release planning issues, or have a potential patch to offer.
Bug database: If you have something that you're pretty sure is a bug, you can submit it here. You can also attach a patch if you have one. If you're not sure whether a behavior is correct or not, or what you have in mind is really additional functionality, bring it up on the user list instead.
If you don't want to involve the whole mailing list, you're quite welcome to contact Macker's author personally.