XCB platform plugin does not read arguments from qt.conf file

I want to specify custom WM_CLASS for my application. The simplest way is to provide -name argument to xcb plugin. To make this setting permanent I want to place it into qt.conf:

[Platforms]
XcbArguments = -name MyApplication

However this does not work because xcb plugin does not check the most of its options in the platform arguments. So far -name could be specified from the command line only.