Quoted directly from Portable Perks:
"For a special experience, try a luxurious poolside cabana at Disneys Contemporary Resort. Cabana amenities include: personalized service from an attentive Cast Member, 32" flat-screen television with DVD player, digital music docking station, mini refrigerator, fruit platter, chilled soft drinks, and bottled water. Members take 10% off with advance reservations! Call (407) WDW-PLAY (407-939-7529) to make reservations."
And from the pool hopping section:
"Pool hopping is not available at Bay Cove Pool at Bay Lake Tower at Disneys Contemporary Resort, Uzima Pool and Samawati Springs Pool at Disneys Animal Kingdom Lodge, Stormalong Bay at Disneys Yacht & Beach Club Resorts, the leisure pool at Disneys Beach Club Villas, and the pools at Disneys Art of Animation Resort. There are no exceptions to this policy."
Doesn't say anything about the CR pool being off limits - just the Bay Cove Pool at BLT. I couldn't imagine they would offer the Cabana rentals in the Portable Perks if it wasn't open to any DVC member.