One thing that really bugs me is if I create a custom block in a sprite, I can only run that block in that sprite, but if I want to run it in another sprite I'd have to duplicate the definition to another sprite also. Is there a way to make custom block work in multiple sprites? If not maybe there should be an option in “edit” or possibly a feature in which the custom blocks in the stage any sprite can run.

Currently, the only option is duplicating them. In a future release, they may allow global custom blocks, but I don't know.

Is it possible to put them in your backpack?

It looks like this is a duplicate topic of this one over here so I'll close it to keep the conversation all in one place.

Please use the existing topic in the link above.