I have to say that I don't like it. It feels too specific. The question in question is: Is it possible to compile a *TeX document with a single command?. I think that in this case, there's no need for an extra tag. In general, I'd like something a little more descriptive (though I'm having trouble thinking of one).
It should either be "shell escape" or "write18". That's simply how it's referred to, and it's how you enable it on the command line:
I'm generally not in favour of being too prescriptive about what tags should be in use, although I'll concede that a tag for this idea won't be used too often.
So I think it's fine.