Fair enough. Sounds great.
As a recommendation, maybe within v4 or v3, would be to include notifications upon reply to thread if the thread is watched within the app.
Basically the same thing as email notifications, but within the app itself.
This would take more continuous querying to the server however, so it should be able to be turned off on mobile (in case the person is low on bandwidth/data).
Notification for watched threads would be cool. But yeah, you run into a polling issue on mobile ( bandwidth, battery, data consideration ). Maybe a server that does the polling and does push messaging to the app on updates might work. Don't know bitcointalk.org's policy on scraping or whether they would ban for one server/ip continuously pounding the server looking for updates.