I’m not seeing any way to add these type of bits properly. V-Bit and Scribe don’t allow flat tips and End Mills do not allow angles. I’m not seeing how to enter large surfacing bits either?
It would also be nice to have more than one level to folders
Follow up: I know step-over was mentioned in one of the videos, but these large surfacing bits recommend step-over over 50% (60-80%) for quick/rough pass
We’re working on the required code to be able to generate toolpaths with more than a 50% stepover. You can do more than 50% if you use a Raster fill path method
Flat-Tip V-Bit, example: This is a screen grab from another software I have a license for. It calls these type bits Conical-Flat
What would that be used for?
If your machine can handle the chip load of that much stepover. It may limit depth of pass, where you would need 2+ passes. Just thinking out loud. 
Rowmark engraving plastic sheets
220v 4-Pole liquid cooled spindle
I’m in the process of adding support for flat-tip V bits.
a large area surfacing mill is just an end mill as far as MillMage is concerned.
