Of course:
String HarmonyHubCasitaActivity "activity [%s]" { harmonyhub="<[HarmonyHubCasita:currentActivity]" }
String HarmonyHubCasitaYamaha "Yamaha" { harmonyhub=">[HarmonyHubCasita:press:Yamaha AV Receiver]",autoupdate="false" }
String HarmonyHubCasitaTivo "TiVo" { harmonyhub=">[HarmonyHubCasita:press:TiVo DVR]",autoupdate="false" }