You don't want to load values dynamically. Well, then why don't you just use the system's environment to store those temporary values? How many values are we talking about and what are you planning to use them for? Anyway, the benefit is that if you have more than one perl program, then one can set the environment variables, and all the other perl programs that run after that will see those values and can easily access them using $ENV{'myvar'} I can't think of an easier solution than that.
If by accident, you forget to set the environment variables, then your program can easily check to make sure they exist. For example, you could write:
my $V = exists($ENV{'myvar'}) ? $ENV{'myvar'} : 'default value';
OR
exists($ENV{'myvar'}) or die...
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