Thailand is becoming expensive; therefore, some Westerners should consider leaving the Kingdom. Maybe Thai people should also leave en masse!
Or - here is a thought - to restore the balance, those Westerners who whinge should exit and/or stay away and let the Westerners & Thais who enjoy the Kingdom to remain.
In that case, the presumption is that a seerious offence causing your disqualification from driving shall have an adverse affect on your Thai Immigration.
At the officer's discretion, you can present evidence in mitigation (ie you have served the punishment, it is "spent" etc..), it is not relevant or you have been rehabilitated.
I am not sure you understand parts of the LTR visa Aplication process for foreign employees sponsored by a foreign company ("Work from Thailand Professionals"); because the sponsor must provide evidence and reporting about the corporate revenue or stock exchange status.
1.1) There are many foreign companies that have satisfied the financial threshold to sponsor foreign employees in Thailand on the LTR visa.
Our Thai law firm has assisted circa +25 in the last couple of months; inclduing the ongoing compliance requirements & reporting obligations.
1.2) Accepted that wealthy private individuals or certain professionals, which do not have a foreign employer shall have a different application & threshold route. But that is not applicable to the OP's fact-pattern; so irrelevant.
2) In regard to foreign Branches/ Representative offices & Trading Offices - again - the Thai Ministry of Commerce / DBD & Revenue department check with the Immigration before authorisation by the Labor department to issue the work permit.
3) If a LTR visa holder ends the employment contract it shall directly affect the foreigner's visa status and the guidance is that the sponsor should notify the relevant Thai authorities.
OP stated if a foreign person on a LTR visa was to quit or lose their job while
Therefore (i) the foreign employee in Thailand should notify the Thai Immigration; and (ii) the foreign employer, which sponsors the foreign employee's employment, is required to notify the Thai Immigration, Labor Department, DBD or Thai Embassy in the foreign jurisdiction.
This is a part of the ongoing contractual obligations contained in the application for LTR visa. Failure to do so could affect future applications or result in non-compliance. This is the Thai legal position, regardless of potential practical issues in enforceability.
I expect the foreign sponsoring employer shall often be more than willing to notify the Thai authorities to end its ongoing obligations.
The "agent's" authority and powers are defined by the contractual arrangement with it. Unlike in Common law jurisdictions, fiduciary obligations may not be directly implied or applicable.
Therefore, unless there is an express contractaul term defining a particular obligation (ie advice of best option) owed by the agent to the principal, s/he does not need to determine the best route.