I tried to do the same thing a while ago, and didn't proceed exatcly for the reason you mention. Here are some thoughts:
- best thing would be: Jason adds some code such that if you pass in "update_one=1" (or something similar), then only the forum_id you are giving in the url is added/deleted.
- if he doesn't want to do that then you would have to create a global where you find you to which forums a users subscribes. Then you'd have to create a link (or a one button forum) that takes all the output from the global and formats it correctly. This would also allow you to change the link text from 'subscribe' to 'unsubscribe' if the user is already subscribed.
- redirection can be done by 'redo=forum_view'
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