Actually, I'm not surprised at all that this functionality is missing . . .
Hmm, I figured that there might be a rationale. However, if that is true, then why are there global minor modes like global-font-lock-mode?
Could you perhaps be more specific in the description of what you
want? Specifically, what files do you visit in the buffers that you
must have in column marker mode? Do these files have some special
extension, or turn on some specific major or minor modes, or have
something else in common?
The purpose is allowing my window to be wider than eighty characters but knowing where the eighty character limit is. Some of my coworkers write code that is wider than eighty characters. However, I cannot stand wide code and company policy is an 80 character max. So I'd like to be able to easily read the long-lined code, but I'd also like to have a guard that will prevent me from going over the line.