Black and White copies are sufficient. I recently went through this process at MTT 2 months ago. The documents you listed are sufficient. They did NOT ask for my TM30 but like you said, it is good to have it anyway. Lastly, don't forget to have 1,900 THB. Good Luck.
Both Tod and Bob are correct. Form doesn't mention anything about overseas requirement for 1 Year Extension. I recently got these forms from CW Office in BKK.