Furthermore, all the documentation is for users, not for developers, I am trying to find something about the code, but there is not information available.
What is worse, i found a bug, when creating extra fields; if a field is selected when clicking "new", it doesn't creates a new, but edit the one that is selected, in other words, we have 2 edit buttons on it; the "new" button and the "edit" button.
Have you contacted support? or Posted in the forum? There is no bug in the code itself, also remember Listbingo is just a component that runs along side other extensions too, and there are other factors that can affect its proper functioning.
About the developer documentation, The documentation is available for developer only. Why? because we have seen general users altering code and then asking for support on their altered code, which violates our guidelines for support. We cannot give a support for altered codes.
Please review the product features and make sure you contact support or forum before you post any review about the product. Low rated reviews are not good for the extension, moreove these are the reasons, people will not try a good extension.