I was just thinking of a similar idea the other day. I had two recipes, I forget which ones, that each required 1x Alchemical Silver and 2x Stabilized Mutant Genome (for example). Both salvage requirements were white, so I went to go craft. I crafted the first one -- then the Craft button for the second one went gray. I had enough Alchemical Silvers for both recipes, but only enough SMG for one. I do this all the freaking time with recipes like this and it drives me nuts. I was thinking it would be nice to have a third color to indicate that you have enough of that salvage item to craft some, but not all, of the recipes in your inventory.
As for the Vault, maybe instead it could just be a remote listing (just a list, not the salvage window itself, that would defeat the purpose of having an actual building for the Vault).
"You don't lose levels. You don't have equipment to wear out, repair, or lose, or that anyone can steal from you. About the only thing lighter than debt they could do is have an NPC walk by, point and laugh before you can go to the hospital or base." -Memphis_Bill
We will honor the past, and fight to the last, it will be a good way to die...
When you hover over a recipe and get the listing of what salvage you need, why not have a third color for salvage that you have in your Vault? (Blue, green, yellow, whatever) Would make it easier to know what you have to buy without making trips to the Vault or keeping a separate inventory list on your desk.
Icelock - Ice/Storm Controller
Command Bot 1 - Bot/Traps MM