No MLS, I just have an FAA certificate. Seems quite enough hassle just to keep one licence up to date, BFR'd, medicalled, etc.
And I spent a lot of time in the USA on work-related matters.
But now, if I get a visa to do some rating or other, I wonder whether I can also do, on the same trip, other activities such as business meetings etc that I would otherwise be able to do legally on a trip within the visa waiver scheme. Or must I make a dedicated trip where my only activity is flight training for which the relevant visa has been issued?