Trouble with Build Interface with Special Curve

[rpstester]

OS: Windows 10
Version: 0.3.2 develop (and release)
Commit/Build: 79c6b22

When you build a wooden coaster or similar, you build a special piece which is down slope to curved banked turn.
There is also the opposite piece, curved banked turn to upward slope.
The problem is that when you select this piece, the interface locks you in, most of the buttons are locked.
It takes 2-3 clicks to get back where you started.
It's hard to explain; please see the video for demonstration.

My request is that more buttons are unlocked so you can toggle between the normal curve piece and this special curve piece.

• Reproducible in RCT2 (vanilla)?
  Specific to multiplayer? no

Steps to reproduce:

1. Build a wooden coaster; after a downward slope, select a small curve, and then click the "level" button to get this special piece
2. The other way is after a banked curve, select a small curve and click the "slope up" button to get the inverse piece

Screenshots / Video:

https://youtu.be/7kvvV_v3CnM