[MacPerl] MPW Perl 5 Tool ignores command-period

[ct@if.net (Chris Thorman)]

Dear MacPerlers,

I am not a newbie by any means, but I can't seem to fix this simple problem:

Once I started using Perl 5 (MPW Tool) several months ago, I stopped being
able to use Command-period to halt the program during console output.  In
fact, it only seems to be checked once... right after the script is
compiled and before it runs.  Otherwise, command-period is ignored as far
as I can tell. It worked fine in Perl 4.

This is very annoying, esp. when debugging a script that might unexpectedly
produce pages of output; often killing MPW and restarting it is faster (!!)
than waiting for reams of unstoppable data to finish scrolling across the
screen...

Any assistance will be greatly appreciated.  Sincerely,

-c

P.S. I was prompted to write this because another recent message suggested
that Perl 5 uses different MPW output buffering from what Perl 4 used.
Could this be a clue?  Is there a workaround?