Althought, this being a 'throw-away' script
In my experience there's no such thing as a throw-away script. They always find a way to stick around until long after they were supposed to be discarded. A little extra planning and testing can save you a lot of time down the road (consider why you use strict).
any possibility of a break in security etc. is minimized
A security policy requiring basic security practices for all scripts should be followed even when deadlines are rushed. Placing a CGI script online without basic measures like taint checking (yes, that's an oversimplification, I know) should not be allowed to happen. Security is a tradeoff, but basic checks are almost always worth it.