If you aren't comfortable editing the xml manually you could always export it after you make the changes. Everything tied to that products installation xml will be exported.
ACP -> Plugins & Products -> Manage Products
Click products dropdown and select Export
--------------- Added [DATE]1244156984[/DATE] at [TIME]1244156984[/TIME] ---------------
Oh, I misread this, I thought you meant making changes to the values after install. I don't know if a GUI tool for editing the xml.
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