Well, give us a banked road to platform transition, mirror versions of the banked corners, an uphill GP to platform transition, banked platform curves, 3x3 GP curves, a 2x2 GP S-bend, more than one platform tunnel piece with an open roof, lower wallrides and loops, platform ramps that don't make the car flip, GP pieces without fences and lightposts, a cliffside road hill without an intrusive overhang, a curve that transitions from flat to banked, an offroad to platform transition, blocks that can be placed on the ground without causing bumps to appear, etc etc etc etc etc etc etc.
Unfortunately Nadeo didn't get around to implementing the other half of the track blocks because there was more money to be found in Shootmania.