Option 1
I sure would love a way to turn on all possible email notifications. I had to go through product, by product, forum, by forum and add myself as a member if possible and then set the email digest options. In my profile I see that there is an area where i can easily change my digest options, but have found that i am only able modify digest options for groups that i am member of or groups that i am no a member of but have already specified digest options for. There is no way to in bulk, turn on email digest options for groups i am not a member of. This requires me to add myself to each of those groups and then if i am accepted i can see that i can add that, otherwise, the one by one approach is my only option. I'll tell you, even having to do this manually has netted me some wonderful results as i have seen all the activity that happens here on the forum each day and am seeing daily, things that i would otherwise have missed.
Option 2
An activity stream for the forums as a whole. However i'd like to see it in my email and i'd like to see each item not just the top 20 or so. (which could be a lot in a day)