are these type of tank battles now possible in the mission editor or online maps ?

[SEE]

Yes, it is possible in SP.

Using FMB you can use the script commands to monitor Ground Units that take/lose key objectives during the course of the mission. These can be used to control the outcome by spawning additional ac, both enemy and friendly, the player is responsible for ensuring that their ground units succeed.

I created a SP mission based on Ground unit battles some time ago. The accompanying video I did for the mission and mision description (Liberation) is buried deep in the FMB thread somewhere.

Also, check the REPKA Operation Sea Lion server as this features moving front lines and advancing ground units both on land and Sea. Players dictate success/failure and progress of moving units.