[Feature Request] Per-feed default sorting

I'd like to be able to set different default sorts for the 3 main feeds (front page, local, all). Personally, I like sorting my front page feed by "new", and the other two by "hot." In the current version of the app, I need to manually switch the sort each time I switch feeds (which is a pretty minor inconvenience, but hey! Isn't that what feature requests are for!).

As a side note, I've been absolutely loving the app so far. Keep up the great work Kuro!