I'll give this a try, I really dislike constantly having to type in password twice, same reason I disable UAC, because of the contant prompts, but have enable UAC due to member suggestions and gotten used to the notifications.
It has nothing to do with LastPass. LastPass has multifactor Authentication if you enable it.It will still auto fill your username and password on MT
You enable two step verification and select how you want to receive the code email,text message.
You will receive a code that you must enter to log in and you will also receive back up codes.
You can tick "trust this computer for 30 days"
Everyone should have 2FA enabled, and the new members or the members who are not using this feature, will see a pop-up (will appear only once for 60 seconds) recommending this extra security step.
I know that needing a second step to login may be seen as a hassle, however with the "email verification" and the "30 days - trust this device" feature, it should be very easy to use.