Part of the larger XFO Project.
From the readme at XFO-NV.com (go there for updates and details!):
Now you can gain TWO perks per level! While it may sound like cheating, most never thought that when they went from a perk every two levels to a perk every level. The wasteland is harsh, and perks are fun. Plus, there are so many perk-adding modules (like my own "perk paths" at http://newvegasnexus.com/downloads/file.php?id=39051 or XFO-NV.com


NOTE: Not recommended for use with Swift Learning, at any rank. I've put in a check, so if you have swift learning, you may simply lose a little xp each time you gain an extra perk, but not necessarily, and shouldn't be much at all (whatever passes over the new-level mark will be lost).