Add a global setting to limit automatic downloading of large files
If you subscribe to a lot of podcasts, using the filters under custom settings for each podcast can become very onerous. This proposed setting would apply to all podcasts and be overridden by per-podcast custom settings.
If you want to get really fancy, you could add podcasts that were blocked from automatic downloading to a "Review" queue. This way you could selectively download large files that you may wish to have. An alternative would be to flag those large files such that they are downloaded automatically once connected to WiFi.
The goal of this setting is to prevent unintentional downloads, and thus large fees, on a network were you pay for bandwidth.