You might be better off going to a Canvas widget for a smooth indefinite scroll, like for a teleprompter.

#!/usr/bin/perl
use warnings;
use strict;
use Tk;

my $mw = MainWindow->new();

$mw->geometry($mw->screenwidth . 'x' .
              $mw->screenheight );

$mw->title("Scrolling text ----- Click to exit");

my $canvas = $mw->Canvas(
    -height     => $mw->screenheight,
    -width      => $mw->screenwidth,
    -background => 'black',
    -relief     => 'raised'
)->pack();

$mw->fontCreate(
    "fonta",
    -family => 'arial',
    -size   => -30,
    -weight => 'bold'
);

my $adjust;
while (<DATA>){
  chomp;
  $adjust += 50;
  $canvas->createText(50,$mw->screenheight + $adjust,
         -text   => $_,
         -fill   =>'hotpink',
         -anchor => 'nw',
         -font   => 'fonta',
         -tags  => ['mover'],
         );
  
  
}

$mw->bind( '<ButtonPress-1>', sub { exit; } );

my $id = $mw->repeat(20, sub{ $canvas->move('mover', 0, -1);} );

MainLoop;

__DATA__
Attack of the Microsith
Not so long ago, in a computer not so far away,
the evil lord of the Microsith, Darth Bill, was
conspiring with the enemies of Open Source Federation
to take complete control over all motherboards in
the known universe.
 
It was during this monstrous conspiracy, that Prince
Linus had the revelations from the Force, to create
a new electron-manipulation-engine that would be so clean
and powerful, that it would thwart Darth Bill's evil
plans.

In a fortunate turn of fate, a young Jedi named Larry,
came upon a powerful technique of controlling electron-flow
which would free everyone from the dependency on Darth Bill's
polluting technology forever.

Darth Bill became aware of a planned meeting between Prince
Linus and the young Jedi Larry, and assembled his forces led
by the dark lord Daryl, to mount a campaign of harrasment against
the Federation.

Our story begins.............
[download]

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