I received some interesting answers to my cron question. Most people said it was not possible. One person reviewed cron's source code and said the source would need to be modified. One person said I should mount the filesystem with noexec. I'll review and test the answers as best I can.
To answer several people's curiosities of why I keep pushing - when I'm tasked with a quest, I try to tap all my resources, including this list, to find a solution. One never knows when an answer might be obvious, or perplexing, as this question seems to have been. To some, an answer is obvious. To others, it is perplexing. It all depends on each person's level of knowledge. The more one learns, the more things can become more obvious. Thus, we grow.
In the end, like now, I try to provide my findings, and, if valid, may be of benefit to others.
I try not to wear out the list, but do what the list was created for - discussion and inquiry of UNIX and related topics. This question proved to test people's knowledge, and I did get some good feedback.
Thanks to all, and until the next adventure...
Scott