No, we shouldn't, for several reasons:

• Janitors don't change node content, and generally only retitle to improve searchability. See Janitors' Guidelines for further insight.
• Perl = the language.
• perl = the executable interpreter/compiler.
• PERL = a common error made by novices, often helpful in determining what level of hand-holding will be necessary when responding to posts that contain this reference.
• At least in the case of Perl and perl, we cannot automatically know which is applicable without discerning whether we're talking about the language or the binary. That's not a simple s///g.
• Oh, and if I didn't stress it strongly enough, Janitors don't fix spelling, capitalization, grammar, punctuation, etc. We don't rephrase, reword, simply state, or anything else along those lines. It's up to the author to master the language or at least communicate effectively. The Janitors job is just to clean up the behind-the-scenes stuff like monastery-style HTML tags. We clean up, we don't edit.

You yourself are an Abbot, and as such have undoubtedly been introduced to a description of Friar powers and How do I use the power of consideration responsibly? in the past. We can all use a refresher on this article from time to time. Let's do our best to keep considerations reasonable and responsible.