Ah, I see. Thanks for the use-case. That's right in line with how we see people using Application Configuration, so it should work well for you.
A strange work-around could be to use a device and its tags to store some configuration information. When the workflow runs, you can use the Get Device node to get your "configuration device". You can then access the tags to get whatever data you wanted. Then if you need to change the password, simply edit the device and change the tag within the Losant interface.