Currently we have two Touch to Mouse Button solution in this PR. One is the fall-back solution for all widgets in skins and library.
This is basicly the same that X11 does for applications without a dedicated touch support. The second on is this here, optimized for simultaneous control specific skin widgets like buttons and sliders, here in WWidget. For me it is the natural place to have it here for because we have to set here setAttribute(Qt::WA_AcceptTouchEvents) as well.
So i like to stick with it for now and may change it when we fix the remaining touch issues.