Thanks for sharing, that sounds really good!
They are indeed very easy to drive. Throttle control is of importance for two factors:
1. Maximum acceleration on most surfaces will be reached with minimum wheelspin (just like ABS helps to stop a car quicker than sliding/slipping tires).
2. Tire life (I found) to be greatly affected by the amount of wheelspin. On dry astroturf some agressive 2WD drivers managed to wear down tires as much in 2 minutes as I did in 3 entire heats
That said, the consequences of using too much throttle on an FF don't have a big impact on lap times simply because the car misses a bit of pace through/out of corners, not ALL pace like a RWD does when it spins out
Through corners, too much throttle is easily noticable by the car taking too wide a line and some understeer - it's easy to correct. Out of corners it's harder to spot the lack of acceleration, so it's harder to correct too, but still easier than learning to drive an RWD quickly.
The understeer the driver has got on his FWD Buggy probably is down to the front stabilizer setting and/or having too much rear bite. I drive my FF with a stabilizer on dry astroturf and grass, and without one in the wet. Also, if the car is using a gear diff, switching to a ball diff may help in this situation too.