Enables cytoskeletal regulatory protein binding activity and small GTPase binding activity. Involved in several processes, including embryonic morphogenesis; positive regulation of egg-laying behavior; and regulation of cellular component organization. Located in cell leading edge; cortical actin cytoskeleton; and presynaptic periactive zone. Expressed in Q cell; anchor cell; apoptotic cell; epithelial cell; and hypodermis. Is an ortholog of human WASL (WASP like actin nucleation promoting factor).