This is rather evil, but it should work (note: untested code follows)

my @funcsToCall=qw/check scan something/;
while(<*.pu>)
{
  do $_;
  map{&{$_}} @funcsToCall;
}
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the .pu files would define your methods, in the form of simply

sub scan{do scan stuff;}
sub check{etc;}
sub something{yeah}
[download]

And the map would return a list of the data collected by the methods, you would then need some if statements, or possibly a grep to determine. (note2: this is if you need totally different functions in each plugin. If all you're doing is using a different regex or something, just use an array of qr//)