WebOS is already highly optimized for phones. As an example, the way multitasking is done (cards instead of windows, as it's done in Maemo 5) The only way I can think of improving WebOS is: overhaul it, making the UI use uxlaunch instead of the crazy, depend-on-several-services-that-are-not-dbus-and-X thing that it has now, and make it use DEB/RPM instead of the inadequate IPKG. Oh, and a GRID of cards, not a stack of them. Like a hybrid of the N9 and Pre, swiping them away or into view. Oh, and maybe migrate away from Mojo/Enyo to Tizen HTML5? The two are already quite similar.