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The question now is - should one fit a vibration damper pulley on the front of the crank to compensate for the new l/w flywheel setup?
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No, they serve unrelated functions, the 964 used a harmonic balancer to address some issues specific to the 964 crank, a 993 does not have those issues.
The dual mass flywheel was intended to address transmission gear rattling issues(as was the original rubber center clutch)
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Would there be a difference btw a road and a pure track setup?
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no, the difference is between 964 and 993
993 Cup cars did use the harmonic balancer but I believe that was because of production line expediancy related to the early date of their manufacture