A trick I often use in timers(when using strict), is declaring them prior to creating them, so you can cancel them from their callback.

P.S. One of the things I wish the repeat(after) object had was an $timer->is_running method. I always have to set a separate scalar manually to track them.

use strict;

my $stop_flag = 0;

my $timer;
$timer = $mw->repeat(1000, sub{ 
                         #do something

                         #check for stop_flag
                         if( $stop_flag ){
                            $timer->cancel
                          }
                     });
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