To get the Value Format working on ZK we did the following:
added the jquery.maskedinput.min.js file to the project
changed lang-addon.xml file to include the new file
created a new field at AD_Column table, called cof_WFormat
changed the WStringEditor to apply the mask declared at cof_WFormat
if this is a good solution, I can generate a patch and the migration scripts (i need centralized ID access for this) and attach here to be reviewed.
just for reference, an old group discussion: https://groups.google.com/d/msg/idempiere/bFdyTdOAkJ4/Zo9RYZ0oKAcJ