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no, the article is still valid
yes there are some more newer articles about attribute customization on the net
like:
Process Enactment Workshop for the Rational solution for Collaborative Lifecycle Managementwith labshttps://jazz.net/library/article/1093always all Blogs from RalphAttribute Customization – Java Based Value Providers, Conditions and Validatorshttps://rsjazz.wordpress.com/2013/06/26/attribute-customization-java-based-value-providers-conditions-and-validators/Use Rational Team Concert to create calculated fields within a work itemhttps://www.ibm.com/developerworks/rational/library/rational-team-concert-calculated-fields-work-item/
This is excellent, thanks for the resources Robert.