Roundup is supposed to be very flexible as to what
schema to use
in the database. However, a number of modules (notably
cgi_client.py)
depend on specifics. cgi_client.py hardcodes method
names 'newissue', 'findissue', etc. which requires
'issue' to be a defined entity.

It would be good to design a mechanism to get rid of
such dependencies once and for all, i.e. a tool that
can assist admins not only to read a schema definition
file and instantiate the db, but also to
assist in modifying/generating those portions of the
code that depend
on a specific schema (all the frontends, it seems).

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Does it require issue, or does it just have extra handling for issue? If 
it's the latter, it's not a bug, but requires discussion. I'm moving that 
discussion to the developers mailing list.