I think we all have to thank him because of his encouragement. He's one of the great guy's how want to help and teach anyone else. That is also excactly my intention. And that is one of the things why this forum is one of the greatest i've ever seen. Anyone will help each other if he is free and able to help you. Like Akyprian, Shoorick, Jupiter, JimG, Blues, Ragdog... and the others i've forgotton to mention.
Maybe this can help you with your problem:
You can copy "WAAddIn.inc" to "masm\include" folder and then use:include WAAddIn.inc
instead ofinclude \WinAsm\Inc\WAAddIn.inc
which indeed isn't perfect!
Like Jupiter said fixed/absolute path should not be your first choice. As far as I know you can use fasm addin from shoorick to use more than one include path. But I've never done that. Maybe he can give you a advice how to do that. There was a thread about absolute path in projects, but i can't find it at the moment. Maybe someone else remember the where this thread is.