Just wanted to drop a quick note...
Autosubscribe will be in 2.0!
Right now it's controlled from the usergroup manager, you set auto-subscribe to yes and enter the forumid's separated by commas of forums that when added to that usergroup the member can access.
The code even handles overlapping usergroups. For example if you have two usergroups that give access to forumids 9,11 it won't count those forumids twice
I'm thinking we need a PM sent to the user to let them know that subscriptions have been added for forums x and x with links to change those settings if they wish, with an admin option to enable/disable the pm.
I also think I need to code a script to update autosubscriptions, which will overwrite any subs people may have so it'll have to be controlled per usergroup so if you change the settings for one usergroup, you can go and readd the auto subs, without adding a ton of subs for the other groups that people may have tweaked and changed.
The update script will have to make it into 2.0, the PMs may make it into the next version depending on how easy they are to code in