My sincerest apologies if this has already been suggested!
I think it would be marvelous to have, perhaps on the Currencies page, an "add all currencies" button. This would add all currency items currently in your inbox to their respective banks. Like if you had Steamworks Trinkets, Lounge Trinkets, and Wizard Tokens all in your inventory, you could click that button and bank all of them at the same time. (Kind of similar to the add-to-collection buttons on beanbag/plushie collections.)
It would really help during events like Masquerade, where there are multiple currencies. It would also help when you're questing and aren't sure if you've got any currencies in your inventory - you could hit that button and get them put away without having to dig for them.
I like this idea.
During masq, I frequently used the turn in both trinkets secret link and it was very convenient. There were many times while dancing that I might have the occasional wiz token, subeautique invite and of course, all the trinkets.
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I support this. There are a lot of currencies on the site, and I can see people having multiple in their inventories at one time (hell, it's happened to me - I was dancing, wiz questing, and fragging last week!)