Is there in X5/X6 any kind possibilities to have default SHIFT F9 switch between Enhanced and Simple Wireframe? Every time when start new file it is necessary to do switch between Enhanced and Simple Wireframe, how Corel remember this two options.
You'll find Wireframe and Enhanced under Tools > Customisation > Commands > View so should be able to assign keystrokes there.
But you might have to hunt around to find an unused key combination -- I don't know of an easy way to tell which keystrokes are currently spare.