Don't know if it helps you Alan but just got back from a visa run, was staying in phuket and thought i would go to Panang and try and get another 1 year visa, Yes i could of got a one year visa had i had the right paperwork! Having just sold my business and thus not having the company anymore all i could get was a 3 month visa! This however is free, it cost me 4500Baht for pick up from hotel in Phuket to Penang 1 night in hotel and food once going once coming back!
So if you have a registered company yes you should be able to get a 1 year multiple entry visa!
However next time i think i will fly as the 10 hour drive killed me couped up in a minibus with no tv/dvd like on some visa runs from Patts to Cambodia!