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Regarding the customizable user page... while I think this would be nice for some sites, I don't think it belongs in the core. e.g. A corporate site that uses XOOPS probably has no desire to let users have their own homepages and is mainly interested in posting their own content for their customers. To me, the current homepage is useful enough as is for looking up contact info and searching for old posts (when you remember the author but not the thread title). As was suggested, I think a module would be the way to go for this. I don't know if such a thing exists, but perhaps you could use a wiki module in the meantime to provide customizable user homepages.
Just my 0.02
