This is something that we very much want and aim to do in Moodle! However, what you want to do is beyond the "simple hack" category for the moment. I 'm not sure how you could do it easily, it would definitely take careful programming. So for now I can't offer any help with that.
It's very useful to know what everyone would want to do with Blocks in their Moodle though! It's much more productive to design a good framework from scratch around known ideas than to adapt it to support new ones, so keep it coming!
Blocks
Replicating blocks in all courses
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