I don't like running full speed through dungeons, but the walking speed needs to be about 1.5x faster for me. Is there a console command or variable somewhere I can change in the editor that will increase my walking speed only?

After a brief search I came up with http://www.tesnexus.com/downloads/file.php?id=33994. I haven't tried it, but he says that he tells you how to change the walking speed in a doc included in the download.

Would not an augment speed spell but toggle "always run" to OFF accomplish a similar goal?

Indeed. Make a fortify speed spell as suggested and voilá! Your walking may look funny but try to ignore those staring at you with a raised eyebrow