Bell's decision to design the 429 around the FAR27/JAR27 rules was either incompetence or arrogance. That said, they will soon be starting to flight test the 300th 429, and with sales buoyant in most of the BRIC countries, maybe they aren't too bothered about those who fly under FAA/EASA regs anyway?
Kudos to the 429 which will soon surpass the combined production of the 222, 230 and 427, in quite quick time, too.
If ever there was a sniff of any way FAA or EASA would approve above the 7000lb FAR27/JAR27 limits, various manufacturers - both rotary and fixed wing - would have something to say. If you want to change the rules, you get all the players together to agree new rules together - not go out on a limb and risk your individual reputation. Rules are Rules, and it's fair if everyone plays by the Rules.