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I took the "BankItems toggle all bags" slash command (/bi all) and made it into a FuBar plugin. About 1000 times more complicated to code, but so much easier to use.
Bankitems can be found here:
Note: This addon was based on KTMFu which was in turn based on DamageMetersFu (which is now being maintained by bsdll, the author of KTMFu). If you want to hack away at this to make your own "FuBar toggle button" mod, go for it, I don't care.