Hi rje!
I have experience with reinventing the wheel on this type of thing ( wrote a Java parallel processing framework from scratch )</brag> and I think that its not going to be a lot of work ( you have a good idea for it ) and that you'll have fun doing it.

You might do something like this:

opendir( DIR, $command-directory ) || die "cant open dir: $!";

@commands = readdir( DIR );
@commands = grep( m!\.pm$!, @commands ); # only .pm files

$torun = "thetime";
$arg1 = '.....';
$arg2 = 'etc.';

foreach ( @commands )
{
   if( $_ eq $torun ){ $continue = 'true' }
   else{ $continue = undef }
}

if( defined( $continue ) )
{
   require ("$torun" . "\.pm");
   ${$torun}::{$torun}->( $arg1, $arg2 );    # run subroutine $torun i
+n file $torun.pm
}

if( !defined( $continue ) )
{
   print "no such method call: $torun\n";
}
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You could have the procedure subroutine and file share the same name. * only key parts are tested. Good luck!