I'd put Schwarzkopf Coasters at the top of my list. After that would be Premier LIM Launched Coasters.
I spend most of my time building coasters, so I'd love to see additions in that area. The other thing would be the ability to have corkscrews/loops/inversions start from banked track. It's always awkward to have to unbank track just to use an inversion, and often times my own corkscrews come out jerkier than Jack Links (the track smoother doesn't like my custom inversions either). I think improvements to the prefab pieces would be really nice, like control over the transition in/out lengths once the piece has been placed.
+1 vote