Well.. the support you looking for is like logic support.. not something like issue / bugs.
Taking most of the software applications / libraries / tools even i encounter - free or paid, will take their time for such support. The money paid is for the library / application and not for supporting logical solutions. .. you must be well aware .. that even free / open source products are free to use but are charged in highly for such technical support. Such comes nothing less then high price .. you too are aware i believe.
As for, i have seen Johny, doing his best to fix in technical issues / bugs .. etc. As for other technical / logical requirements, we do try giving in as much as possible. Even i am a developer an do understand that not everything can be cracked by every single person. But definately it is an art which everyone can develop and take things to next level.
As for my experience with GroceryCRUD, the library is out for around 5 years or more now and the purpose the library was built was base... but the possibilities ppl have taken to / used it .. is sky high .. even Johny wouldnt have expected such stuff would be possible. Infact ppl have build external plugins around the library and shared in ..
I have been following your edit_fields query. .. i didnt really see it as any issue, its just your lack of understanding of the application of the logic. Those, you may develop by digging in deep or learning by other developers experience. If there is any issue you are facing as such, do share in, i definately will like to learn it and work aroud possibly share solution for the same.
Happy GCing :)