Tv extras

Hmm...  this seems like it's going to make more requests than we'd really want (one for each episode of each season, when the vast majority of these things will _not_ have extras).  I realize right now things are pretty much flat on the server side (each show/ep/season is treated as its own item), but would it be more efficient to group them together somehow and make a single request?  Or at least keep track of which items actually have extras and return that data with the series-level request?