This should be supported, so you should create a problem at http://jira.grails.org/browse/GRAILS
In the meantime, I think in order to maintain backward compatibility, you probably need a way to differentiate script names from args, for example. prefix:
grails run-script utils/adminAdd.groovy -Jusername -Jpassword -Jfoo=bar
Then run-script
can split the args list into un-prefixed script names and send de-prefix arguments to each script as it runs.
As soon as you receive it, send a transfer request locally or attach the updated script to JIRA and it will be fixed much faster.
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