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my $cgi = new CGI::Applicaton(...);
$::global_var = $cgi;
... use $::global_var now anywhere ...

...
{
...
  our $global_var; # same as $::global_var and $main::global_var
  ...
}

print $hash{'key'}    # same as print $webapp->param('key')
$hash{'key'} = 3;     # same as $webapp->param('key', 3);

our %hash;
my @all_params = $webapp->param();
...
  $hash{$p} = $webapp->param($p); #
}
... use %hash instead of calling $webapp->param(...) ...