simple idea, a popup window to notify when a player on your kinlist comes online. not necessarily every kin, only ones specifically marked for this purpose. this would be really helpful to see villagers that come on, or that elusive trade partner that you've been looking for for a week or so.
i know it only takes a couple seconds to click on the heart and sort by status, but something like this would beat the hell out of checking the kin list every 5 minutes looking for someone in particular