That would take a lot of effort, don't you think? It would also be really difficult for new Scratchers to understand... It was implemented in a hidden feature of 1.4 (learn more here), but was taken out because it was really hard to understand - which it was.
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Maybe for the new blocks, if hooked up to mesh, it would give a numebr to the project, and instead of the sensor block thing, there would be something like, "[share (variable) with [project2 v]]"
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