CoolP,
i agree with most you wrote about DME Arcs and procedure turns.
As well i know that there is no possibility in a real Boeing FMC to change a waypoint to "fly-over".
In SIDs and STARs there are "fly-over" waypoints. Other developers got the fly-over information in their navigraph nav-data and the airplane will follow the procedures according to the charts.
The CS navdata got no fly-over flag. The best way would be to add this information to the data. Navigraph is able to provide this flag.


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That's a simulator based factitiousness, so to speak. In the real world, you wouldn't be allowed to use such data for any FMC guidance. You would be rendered "unable" to follow that approach if the FMC would be your only source of guidance there. Choose another approach then (if available) or, depending on the plane, use the basic VOR instruments to fly that arc. It's much fun to go with the needles only.

Acoording to Mike Rays "Unofficial Boeing 757/767 Simulator and Checkride Manual" it is common to "build" an DME ARC using waypoints every 20-40 degees (depending on distance to the VOR):


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"If you are cleared for an ARC approach that is not in the CDU database memory you will have to construct it, use the green circle, or fly it without the benefit of the glass.

Of course you always need the raw data displayed, but its OK to fly it as a polygon using LNAV.

Regards
Nepo