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Hmm, don't know what to say.
One thing to look out for when adding plug-ins, is make sure they are compatible with WP 2.04 and above. XPress comes bundled with an older release.
The current WP release (at the time of this posting) is 2.1
Other then that, in terms of your original post, I don't think there is much that can be done.
I can't see phppp writing a new feature for XPress that isn't native to Wordpress, with the odd exception to functionality within XOOPS itself, like the selectable Single user/multi user option, which is really a configuration automation from within Wordpress itself.
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