I like this idea a lot, and while I understand the objections people have to invisible code, there is a simple way to get around it: Don't make it invisible.

As it stands right now, a <readmore> tag shows a link to an expanded version of the post (or rather, the post itself). What if the <hidden_code> tag shows up as a link reading something like
View full code...
I feel it is important that there is some indication that the code is there, rather than having it only show up when you follow the 'd/l code' link.

Of course, Monks should be discouraged from including too much hidden code. If you've got a twenty-module project that's getting b0rked by one sub, don't include the whole thing! :oP

LAI
:eof