Yeah, my original post was pretty abstract, but that was mainly because I hadn't written any code yet. =]
I'll get down to some helpful details here.

I was coming at the same problem here from a different angle, and in a slightly simplified case. The general, long, drawn out form I'm looking at is this:

#I have some variables, and some ranges.
#really it's in a tied hash somewhere.

my %hash = {  #pretend that this is my tied hash
    a => "20",
    b => "yes",
    q => "1e-14"
};
my @range_a = (1..20);
my @range_b = ("yes", "no");

#each variable of interest has a foreach loop
# to go through the values in it's range
foreach my $a (@range_a){
  $hash{a} = $a;

  #other variables may be involved.
  my $seed = srand($a + 42); 
  my $randomness = rand($seed); 
  #or a function
  func_1(%hash);

  foreach my $b (@range_b){
    $hash{b} = $b;
    my $foo = $b + $a;

    #Then, at the innermost level, do something
    #There could be any number (probably below 20)
    # of these loops.
    my $result = end_func(%hash);
  }
}
[download]

I have already solved this with a recursive function and a hash of hashes containing the tied hash keys, the ranges they need to take on, and the statements that go in each layer. This was a little ugly, though, and scoping was interesting, to say the least. I was hoping to reduce the complexity for users dealing with this by objectifying it. My vision was something like this

#create objects in my class
my $a = param_class->new(\@range_a, $statements);
my $b = param_class->new(\@range_b, $statements);

$a->loop(
   $b->loop(
     &final_sub(%hash)
   )
);
[download]

That's an ugly generalization, but hopefully that is more telling of where I was going with this rambling.
I'll be back tomorrow to talk more with you all about this.
~MB

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