As an administrator, I want to optionally disable access to a blocked user's watchlist in much the same way as I can revoke talk page access now. Banned/indefinitely blocked users still use their watchlists and then use socks to edit. See discussion.
Not a huge fan of this. None of the other admin blocking powers can disable "reader-focused" features that only affect the user directly (e.g., we can't stop people from browsing pages). Also, it doesn't seem particularly useful.
A watchlist is used for users to keep track of pages they want to follow, and being blocked should not remove the ability of users to follow pages they are interested in. If it is truly needed, locking an account globally should prevent a user from accessing their watchlist, but again, watchlists are reader-oriented features.