First question:
Is there a way to add additional config items to an override?
It seems that no getter and setter is created.

Code:
Ext.define('.....', {
	override: 'Ext.data.association.BelongsTo',
        config: {
                myConfig: 123
        }
        ....
}
Second question:
How can I override config values? So that I can override a default config value