Where did you read this? I did not find a mention of a "non-competitive class" in the 2013 rule book under 8.2.
8.2.7. Not For Competition
8.2.7.1. IDPA encourages shooters to practice their gun handling skills with commonly carried firearms.
Many everyday carry firearms do not fit into the 5 competition divisions.
8.2.7.2. IDPA allows clubs to add a Not for Competition scoring division for Tier 1 matches only. This
allows calibers smaller than 9mm, carry optics, and other pistols which do not fit into the 5 competition
divisions to participate in local club matches.
8.2.7.3. All other IDPA equipment rules apply for holsters and loading device holders as well as their
placement on the body. Match Directors also have the option to allow junior shooters with .22 rimfire
firearms to begin strings at low ready in lieu of requiring a holster.
8.2.7.4. All IDPA membership rules apply.
8.2.7.5. Clubs are not required to implement this provision, and Match Directors are allowed discretion
with implementation so that match quality remains high.