Dragonvale question: If I jailbreak my iphone, is it possible to "unlock"/"access" all the limited dragons?

I recently got re-hooked onto Dragonvale, but already I see why I stopped playing it in the first place. You can only go on for so long without having the urge to buy gems with real money through in-app purchases. It just isn't possible to earn enough gems without cheating to upgrade some of the buildings and buy some of the rarer dragon eggs. I want to jailbreak my iphone so that I can cheat the in-app purchases and buy as many gems and coins as I want, so that I can stop worrying about breeding the rare dragons and just buy the eggs. But what I really want is to unlock all of the limited time dragons that have already come and gone, ESPECIALLY the gemstone dragons I've missed. I'm not waiting a year for them to come back! Is there any way that jailbreaking my iphone will make these limited dragons eggs appear in the market for purchase?

-Thank you SO much!