Regulates lamellipodial actin dynamics in a Cortactin-dependent manner and is therefore likely involved in controlling actin branch density, actin-retrograde flow rates and lamellipodial protrusion. Functions by slowing the dissociation of Cortactin from Arp2/3 nucleated branches thereby increasing branch nucleation and junction stability. Localization to the lamellipodia is dependent on Cortactin. Named 'Nausicaa' after the princess in Homer's 'The Odyssey' who helps to ensure Odysseus' safe passage home from Phaeacia.