Hi, i am also an author at codecanyon, and i can make sure the final plugin came out bugless, includes basic documentation.
Regarding the reports, we can only report including user's email, username & email. I will include extra fields on the profile page as well as a separate plugin page to manage settings, search reports. But what is the final outcome ? i haven't yet worked on fraudtrackr, so don't really know how everything works. But i can handle those api's and get you expected results.
Regarding the milestones, you can atleast make a partial one ?
I can guarantee, all codes will be completely yours, and it won't be used elsewhere.
Thanks.