The first one doesn't really make sense to me, but there is a way you can disable strict 'vars' for specific areas of your code (I've never had a need for no strict 'vars'; before personally, usually no strict 'refs';). Note that all variables outside of the tiny scope (block) that the no strict ... is in is still under the enforcement of strict 'vars', ie. you need to pre-define before using them.

use warnings;
use strict;

{
    no strict 'vars';
    $x = 10; # look Ma, no 'my'!
    print "$x\n";
}
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