Please correct me if I am wrong or missing something. It seems to me that the module name in the config file is primarily a "key" to identify the particular user/password pair you are using. So why not structure the config file thus:

<mydb>
  <config user="fooser" pass="foo" />
  <modify user="barser" pass="bar" />
</mydb>
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(Or, you could specify a database or any other information in there.) Then you could retrieve the credentials based on the functionality, not the module name. Does that make sense?

HTH, --traveler