Thanks for your response. Currently i enable the ionic swipe to go back functionality in the app.module.ts file:
IonicModule.forRoot(MyApp, {
swipeBackEnabled: true
}),
So swipe back works automagically on every view. I looked at the ionic source code and in my opinion there is currently no way to override the edge start. It seems to be fixed in the constructor of the SwipeBackGesture class swipe-back.ts.