Hello,
So getting down to business. The UI team is recruiting two kinds of people. Primarily: Programmers who have sufficient knowledge to hack other people's code, even if said code is rooted deeply in system libraries. Skill in writing user interfaces and piecing together dialog resources. No advanced skills beyond that required. This is most important, since developers in this category can get straight to business and get started on improving ReactOS.
Clearly outline the change desired, and file a enhancement bug on it, you can point people to it that may be interested, and you may have someone from another skill set implement it. I think this is the best method possible. Keep in mind that Martin Fuchs is the maintainer of explorer, so he may have a say on changes. I would even recommend a branch.
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Come up with a list of things needed, and put them on the wiki. You never know who will help, but it needs to be publicly documented.
Yes, that's the best way: Write down what you intend to implement exactly on the Wiki or in Bugzilla. I will help in explorer, winefile and ibrowser as far as possible. But my available time is limited. Branching the code is possible, if you want to change explorer completely. But I would prefer to maintain only one code base. The already existing "lean-explorer" branch may be enough. ;-)
Regards,
Martin