Can give you some info which I know, hope I am not that much wrong 🙂
As far as I know the quick compiler option is only available for paid Qt customers.
I don’t think you can run it in open source version (which is distributed with VPlay).
If you have paid Qt version then to use it you need to load VPlay bits from maintenance tool and don’t use VPlay installer.
Hmm maybe I am wrong with quick compiler.
Wasn’t it released some time ago as part of open source package?
I am not sure now.
It general it does something similar to what VPlay does in production builds.
I think the Qt Quick Compiler is only available when using Qt Commercial license at the moment. Felgo also supports using the compiler in this case.
The QRC system compiles your QML sources along with your binary, the DEVELOPMENTFOLDERS option is added by and just easier for development as you don’t have to worry about keeping the QRC configuration up to date with your sources in the file system. For example when adding new QML sub-folders to your project.