Currently, the optional (and undocumented) <param> tag for a panel <action> uses nested elements to define a key and a value. The similarly undocumented <configuration> tag for a panel also takes a <param> tag in this form. These should be changed to use the name/value attributes common to the other, documented <param> tags in the installation descriptor and UserInputPanel descriptor, and the whole lot should be documented. The changes should also be documented in the Upgrading from Previous Versions wiki page.
There are no PanelAction implementations in the IzPack distribution, nor any panels that use the <configuration> tag. These changes, then, affect only third-party extensions for IzPack. This change for the PanelAction <param> was previously mooted in