My new computer is up and running... and KRP runs like a charm (locked at 60FPS) at highest settings in 1080p (and that's only with The i5 Ivy Bridge's on-board Intel HD Graphics 4000... real video card coming in near future). I am really enjoying the game, and I expect that I will purchase a license soon.
On another note, I did just get the new Rotax Max Karting for rFactor... and it's quite a bit better than the BR Kart mod, but I will agree it's not up to the physics of KRP. The developers on the forum do mention that karts in rFactor is a challenge to develop, as you mentioned due to the lack of suspension on karts and how rFactor translates this. However for me, KRP without an AI to race against might limit my play time with KRP.
On another note, I did just get the new Rotax Max Karting for rFactor... and it's quite a bit better than the BR Kart mod, but I will agree it's not up to the physics of KRP. The developers on the forum do mention that karts in rFactor is a challenge to develop, as you mentioned due to the lack of suspension on karts and how rFactor translates this. However for me, KRP without an AI to race against might limit my play time with KRP.