Rational Group is considering adding a Full Tilt Casino to the brand’s offerings. The owners of both PokerStars and Full Tilt Poker intend to expand into other online gambling options beyond just poker. The firm announced last summer that Full Tilt Poker would be remade into a fully operational online casino with slots, blackjack, and roulette in addition to the online poker rooms. But Rational Group says the remake will not stop there, with plans to open a licensed sports book under the Full Tilt brand.  If the sports book is added to the domain, Full Tilt will become the…