Field values of nodes available as tokens
Have you looked at the Token API? With the API one can define custom tokens. The functions you should look at are:


hook_token_info()
hook_tokens()


With hook_token_info() you define new tokens. In your case you could retrieve all nodes of your configureation node type (with an EntityFieldQuery for example), loop over the entries and create a token for each of them.

In hook tokens you define what your tokens are replaced with - just load the node entity for the given token and retrieve the content of your value field.

Here is a tutorial I found useful when writing some custom tokens a while back: http://www.fredparke.com/blog/create-your-own-tokens-drupal-7