I think it would be great if Roundup allowed you to 
set dependencies or relationships on issues. You could 
specify that a certain issue could not be completed 
until another issue was resolved first, making one 
issue a parent issue or dependent on the other issue 
being resolved.

I don't know if this is something that would require a 
lot of change, maybe just an addition to the class 
list? Although things like blocking of issue 
resolution when a child issue is not resolved may not 
work.

A lot of other issue trackers have this feature, and 
it bothers me that Roundup is lacking in this regard.

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http://roundup.sourceforge.net/doc-1.0/customizing.html#blocking-issues-that-depend-on-other-issues