I think that it is important to include things like DirectX compatability with FreePascal as it shows that it can compete with the existing Microsoft tools. If the "only" benifit of FPC is cross platform, then its not actually such a good product. If it can;t use DirectX as well as MSVC why would any Microsoft favoring user switch.

A game dev edition should cover all aspects, from plat form specific to as much cross platform functionality as possible.