Credential store has configuration in "uri" attribute. All parameters are in one string. It can be confusing and there is risk of typo (e.g. delimiter typo)
In my opinion the main intention for it is to have general solution for custom implementation.

Current state

/subsystem=elytron/credential-store=cs001:add(uri="cr-store://test/cs/keystore.jceks?store.password=pass123;create.storage=true")

Suggestion for improvement:
Better solution to achieve this could be use a map.
e.g. some like that:

/subsystem=elytron/credential-store=credStore:add(cs-map={store.password=pass123, create.storage=true, store.file=path/to/cred/file})

Now credential store name is in URI too, it can be get from resource name.