Yes, US citizens has special privilegies. You can own 100% of your business while other farangs can own only 49%.
So I guess it's same for land.
Phuket International Law (have office in Phuket Town and Patong) is also a reputable law and real estate comapany, Sam Fauma usually give advices for free.
http://www.phuket-realestate-law.com/index.htm
Send them an email and ask.