Support collaborative threads modifying thread starter alert permissions for collaborators
Fix Thread Starter alerts with as-of-yet unreleased "Deferred Alerts" add-on
New option "Thread starter alert on threadmarked reply for anyone", requires Threadmarks Pro
Reduce performance impact of thread starter alerts on notifying watched thread/forum subscribers
The list of users to notify was fetched twice, with large number of subscribers this can get expensive.
Framework to force a thread starter alert regardless of the minimum word count
Used in Threadmarks Pro to push alerts when the thread starter reply contains a threadmark.