How about "every"?

use Every ':threads';

my $process = Every->time( ms => 1000, call => \&do_stuff, args => [] 
+);
$process->start(); #now do_stuff() will get called ever 1000 ms.

# .. later...
$process->stop();
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This would leave open the future possiblity of event- or condition-driven "Every" processes as well, instead of just time-driven.

As for the use statement, you could either do a custom import sub (interface like above) or have Every::threads, Every::fork and so on.