Hi, thanks for buying a copy of the tool!
There's no function like that in Mesh Edit I'm sorry. To do that you'd first have to extrude a new face in mesh edit mode, then switch to tile edit mode to texture it. Sorry to disappoint, a function to add tiles as new geometry would be really difficult to include in Mesh Edit, but I'll keep the request in mind for future updates.
Thanks again for the kind words!