I usually use .md as a Markdown file extension. I know other people use .txt. Is there any way to modify ikiwiki setup to accept this as the suffix for Markdown pages (instead of .mdwn)?

It's fairly easy to make a copy of the mdwn plugin and s/mdwn/foo/ in it and get what you want. But I don't see value in providing this option in ikiwiki as it just reduces interoperability. Not all options are good options, and this would be a bad one.
Comment by joey Fri May 20 10:12:38 2011