I recall a comment about working out a way for initiative macros to work from the app, but @target and @selected won't work until and unless the map itself is added to the app, at which point you might as well just use the browser. I believe the app is more designed towards a group of friends gaming together in-person, using the app for character sheets, handouts, and dice rather than the full Roll20 experience, but I've been wrong before. =)