With Charlie Sheen now in rehab, and the fate of Two and a Half Men up in the air, CBS is starting to make contingency plans. Vulture has confirmed that the network has ordered two extra episodes of its David Spade sitcom Rules of Engagement and has asked Warner Bros. TV to consider making two more episodes of Mike and Molly (which comes from Men producer Chuck Lorre.) The extra half-hours could come in handy should Men end its season after its Feb. 14 episode (the last one taped before Sheen signed off). While it’s unlikely Rules will take over Men’s 9 p.m. Monday timeslot, it’s possible CBS could air back-to-back episodes of Mike and Molly from 9-10 for a week or two on Mondays, or that the network would want to bulk on original episodes of other comedies in the event Men simply goes into repeats for the rest of the season. That latter scenario might sound odd, but considering the fact that repeats of Men draw more viewers than original episodes of virtually every other comedy on TV, it’s not all that implausible.