Grade Kato Double Track
The ability to to grade Kato N (an HO I am sure) scale double track pieces and super elevated track sections. Not being able to do so is a huge barrier in my design.
This same limitation currently applies to slot car tracks with multiple lanes.
At this point grades are restricted to plain tracks, i.e. not for complex tracks like crossing, switches or multi-lane slot car tracks.
The height can be set for any kind of track, though.