Advice from the Thai Ministry Of Foreign Affairs is:

You need to be outside Thailand to apply.

Use the website, make an account and you can edit and change for 14 days, or if you are happy with all your uploads, make the payment.

Cancel your visa?

just leave Thailand and it will expire on mentioned date on the visa

There is no regulation about the time you have to spent abroad before you are allowed back into Thailand.

Making up new rules and regulations, even faster than the clock ticks away the seconds.

What is a 6 months DTV check?

I really hope that after 6 months you still have the e-mail with the visa and did not change the text.

Thailand has a law made in 1979, but it seems difficult to read for lots of people.

The Land owner, OR the house owner OR the landlord OR the possessor of the house reports that a foreigner resided at their property within 24 hours of arrival.

The possessor is the person who PAYS the rent and signed the lease/rental contract.

Just shouting that you as possessor is not responsible is showing you have no clue.

According the same law, the foreigner who is NOT registered is liable for a fine up to 2.000 Thb and the owner of the address up to 10.000 Thb for each foreigner residing.

What is the difference between a holiday, meaning no working and enjoy a new culture

and working, meaning sitting hours behind a computer to gain income.

You can not stay 180 days using the Visa Exempt Entry, it will be 60+30 border run 60+30 border run 60+30.

BUT why not use the DTV?

Prepare yourself, comments on Facebook can not be used to explain an Immigration Officer that questions are not allowed.