Is there a function to order posts within a thread chronologically that I'm missing?
Yep, see bottom of the page. It gives you three options for ordering: Oldest on top, newest on top, and threaded.
On long threads subsequent posts are indented further and further to the right. Eventually we get posts a few words wide and 9 pages long. As each post is clearly separated is it possible to eliminate the indenting?
Sort of. When you select chronological ordering (oldest/newest on top), items are not indented. Unfortunately, indenting is a requirement of threading, so you won't be able to use the threaded order without it.
Eventually, I plan to re-program the message board using "iFrames", as well as some other more advanced techniques such as "Javascript" & "Ajax". But right now I'm working on other areas of the website.
Regards,
Jonathan