Catalytically inactive protein kinase that acts as a scaffold protein. Functions as an effector of the small GTPase RND2, which stimulates RhoA activity and inhibits NGF-induced neurite outgrowth (By similarity). Promotes Src family kinase (SFK) signaling by regulating the subcellular localization of CSK, a negative regulator of these kinases, leading to the regulation of cell morphology and motility by a CSK-dependent mechanism (By similarity). Acts as a critical coactivator of Notch signaling (By similarity). {ECO:0000250|UniProtKB:D3ZMK9, ECO:0000250|UniProtKB:Q571I4}. This is the function of PRAG1 (PEAK1 related, kinase-activating pseudokinase 1, ENSG00000275342).