I can orderBy a column in the parent table, but not by a column in the child table.
e.g. with this...
class Address(InheritableSQLObject):
    town = StringCol()

class Person(Address):
    name = StringCol()

Person.select(orderBy = 'name')
doesn't work, whereas
Person.select(orderBy = ' town')
does.

Actually horizontal inheritance would do better for what I have in mind and as far as I can tell, it works well enough.

God bless,
John