. "\"Any process that modulates the rate, frequency or extent of pathway-restricted SMAD protein phosphorylation. Pathway-restricted SMAD proteins and common-partner SMAD proteins are involved in the transforming growth factor beta receptor signaling pathways.\" [GOC:BHF, GOC:dph, GOC:tb]" . . "regulation of pathway-restricted SMAD protein phosphorylation" . . .