Personally, I find drifting one of the coolest thing in supermoto both as an amateur rider and a as spectator and I wonder how can one achieve that on a Varg like mine, it feels way harder than with a 4 stroke because of the little regen brake.
I've watched some footage of a French rider, Adrien Goguet, riding a Varg and I've only seen powerslides and not the typical drift entering the corner achieved, with ICEs, using the disc brakes but also the engine brake. That guy used to be one of those masters capable of sliding in a spectacular way back in the day and still nowadays professionals slide, albeit maybe not as much. I conclude that it was hard for him to do that.
BTW in the pictures of his bike it looks like he was using a hand rear brake with a Beringer master cylinder.
Here is an article in which you can glimpse the master cylinder and read a comment about the low regen brake.
The idea of having a low power map for the dirt section sounds like a super advantage of an electric supermoto; I think that in that section the Varg is probably the best supermoto out there.
In the Flux Moto thread it was discussed that it could be possible to make sliding under braking happening but at the time, some months ago, it was still in development with not much priority for them. I'm curious to see whether Stark has done something about it.