I can get behind this. Classical liberalism, of course, already calls for limited government, although not necessarily the specific "contested elements of modern economic theory" that Kimball means to include by saying "supply-side."
What I'd really like, though, is if we could simply rescue "liberal" from its contemporary conflation with "progressive" or "Democratic." The latter tend to favour a bigger government and are sometimes noticeably illiberal. (The people who are flipping out about Olympic hurdler Lolo Jones, to give a recent example: progressive, probably, but not liberal.)