Default issue.item.html has the following problem

 When viewing an issue, the editing form is shown
first, then the history in the reversed order (most
recent on the top), which is quite inconvenient. 

I think it's better to show messages first (LEAST
recent on the top) and then editing form...

The primary motivation for this suggestion is very
simple: issues are viewed WAY more often then they are
edited. So putting issue description first  is more
useful. (And even people who edit the issue in most
cases will glance at message description first).

Similarly, the very first message (least recent) will
normally contain the original problem description and
in most cases is the most informative part of the
history and thus should be put first.

Another problem with default issue.item.html is this
when you create a new issue and press "Submit", you get
issue.item.html back and it will show you the same form
which you just filled! The form will be empty (and the
information you filled is somewhere at the bottom of
the page and may not be visible) and it  looks like
roundup has just lost your submission... If message
history is shown on the top, then this issue will go away..

Logged In: YES 
user_id=6405

I prefer the message display the way it is. See 
the "reverse" method in:

http://roundup.sourceforge.net/doc-1.0/customizing.html#hyperdb-property-wrapper