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There is already a way to customize sidebar on most pages on the site; look under "Static Content, URLS & UI" in the Askbot settings module (requires administrator login):
For example, I have added a simple box to my Askbot-powered site:
It's not the most user-friendly interface, and this probably is not an ideal situation for e.g., displaying a list of the most recent posts on a blog or meta site (you'd have to remember to manually update the list in the sidebar every time you made a new post).
But it might be a good workaround until a more fleshed-out widget admin interface is implemented.