I agree. As I travel offen in and out of Thailand this last time I was pulled out and they demanded to see a onward ticket out of Thaialnd I believe next time I will not be so lucky . I will maybe stay out for 6 months next time . They had a whole set at the immigration check in point just for checking onward tickets and questioning .
Hey brother you be fine . I just checked my emails with tickets and not one has my middle name . On my American passport I have my middle name but I never put it in my ticket info .
We where in Cambodia few weeks ago . We didn't use a agent and to fly there was cheap. stayed longer then we planned to be honest . Just be positive to have a return ticket when you come back to Thailand as they been checking for this more lately.