Can I use iTunes Wi-Fi Sync to sync podcast positions? It seems that iTunes Wi-Fi Sync only kicks in automatically (when plugged in) if there is new content, but not modified content. If I listen to a podcast on my Mac, the time remaining in the podcast is not synced with my iPhone. I have to go into Settings and manually perform a sync for this to happen.

Is there any way to have this happen automatically, or should I rely on a third-party tool such as Seamless?
If you plug your device into power, a sync should occur no matter what. Between that and manually triggering a sync (whether from the device or iTunes), I've had no problems with podcast location syncing.