The problem is there's literally countless "Islam-related books in English" out there. There needs to be some sort of notability criteria to determine what would go on the list, otherwise you're either going to end up with a list of cruft, or endless edit wars adding or removing smaller works that may or may not be known and/or useful (see for example The Definitive C++ Book Guide and ListThe Definitive C++ Book Guide and List as well as the relevant revision historyrevision history)
I would love to see a list like this get compiled, but a list where anybody can just chime in with a "I read this book once and I thought it was good" is just going to get really useless really fast.