HI
When you mention bugs, I would immediately like to see them followed by nice informative bug reports. When you mention UI issues, mockups would be great contributions to help in the design of a better UI and while hanging out on #fedora-devel you could always ping and talk to Jeremy and others over their plans for Pirut. Perfectionism is the root of all evils.. I strongly agree with Erwin that including this as it is in the final FC5 release could be damaging to Fedora's image. If all the bugs and UI "nits" are patched up before the final release.
--Rahul
Fedora Bug Triaging - http://fedoraproject.org/wiki/BugZappers