In the small app I'm currently working on, I create 3 or 4 template objects and print each of their outputs. Each invocation of these templates is presenting data from unrelated queries.

This is just a suggestion on how this might be managed (and simplified) with one template object:

sub some_mode {
    my $tmpl_object = $self->load_tmpl('my_tmpl.html');    
            
    $tmpl_object->param( param1 => 'foo'
                         param2 => 'bar',
                         param3 => 'baz');
    
    
    # Poke the data for the top part of the page into the $tmpl_object
    get_top($tmpl_object);
    
    # Ditto for the left side of the page
    get_left($tmpl_object);
    
    # Display the entire templated page 
    return $tmpl_object->output;
}
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Of course you can add parameters to get_top() and get_left() to fine tune their output on a mode-by-mode basis, but by passing around one template object at a time things may become much simpler than having your program eat its tail calling one recursive mode within a mode within a mode after another.