When adding credentials to any of the plug-ins, the Credential Type dropdown box has some random, nonsense credential type pre-selected.

So you always have to look-up the correct credential type for each of the plug-ins every time before being able to accomplish your task. This is a true, repeating niusance.

Hence, I propose that ...

1. plug-ins define their preferred credential type, and
2. Jenkins is going to pre-select this type, read from the corresponding plug-in's properties, in the Credential Type dropdown box when adding a new credential to the plug-in.

This will dramatically ease setting up credentials in Jenkins.