Can be the replacement of the trail by sign to the dirt be removed?

No, grass paths turn to dirt when there's not an air block above them.
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Would be a good Idea to make a Config for this one to EFR, because I doubt installing GregTech 6 just for this Feature is an option. XD

Paths turning back to Dirt just because there is no Air is a really stupid "Feature" on Mojangs end...