Add Preselected Tag Subscriptions

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Continuing on a previous topic: http://askbot.org/en/question/6843/email-subscription-for-user-defined-tags/

I found that effectively subscribe_for_tags is not different from the operation of tag_selector.js, the tags are only stored after a question is posted containing the tag.

Is it possible to let users make a predefined tag-list for the email subscription?

Basically what I want to do is let users make a list describing their expertise, a priori so that they don't have to come back to the forum to update/add their taglist. For q&a within a company this is especially useful I think.