Font preference for preview

Hi, Robert - great program!

I use a lot of zip and tgz archives for source code, and BetterZip's preview is just wonderful for me.

However, a lot of code looks terrible in the standard proportional-pitch font.

How about adding a preference to either (a) allow you to choose the font for preview, or (b) at least choose proportional vs. non-proportional?

Also, some file extensions aren't known to be previewable... things such as "R" scripts and so on. How about a check-box that says "preview as plain text" so these non-previewable text files can be previewed?

Cheers,
-Andrew.