This is going to be pretty hard to make. Or not(that was added in case some pro scripter came and declared it easy). Anyway, the idea is to make a whole programming language... IN SCRATCH!!! Can you do it? Only you decide!
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Well, SRR already has Skip, which he is writing DevOS in. Prism productions also made a markup language similar to HTML, although I forget what it was called. And I made my programmable Turtle Graphics project, but that's not really a programming language as far as I'm concerned.
But that's not to rain on your potential parade. Programming languages in Scratch are still mostly experimental. Good luck to you!
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I think this will need a lot of investment. You need to find some Venture Capitalist. Try driving around silicon valley and you may find one
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I made a programming language-ish thing in Scratch. I named it Cheese.
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