I have maxed every profession. I'd like the ability to figure out "Can I craft $item at rarity X on $alt?", without having to log out and log in. I'm fairly sure that craftsim already knows about the data b/c I've scanned all my recipes.

As it stands now, I can see that my tailor can guarantee r5 for the "Vibrant Wildercloth Shawl", but that's only for ilvl 395. If I'm looking for 486, there's not a way for me to see that.

So you mean like a simulation mode but for any recipe of any alt?

You've got it. :)