How to turn off the trash bin functionality on individual drives?

Same issue here.
I searched the code, and assumed that TrashDisable or similar stuff no longer exists.

As for me, I found a workround:

$ echo ~/.config/ktrashrc
[/home/user/.local/share/Trash]
Days=30
LimitReachedAction=0
Percent=10
UseSizeLimit=true
UseTimeLimit=true

[/mnt/jianguo/.Trash-1000]
Days=0
LimitReachedAction=1
Percent=0
UseSizeLimit=true
UseTimeLimit=false

The key is to set LimitReachedAction=1,Percent=0, UseSizeLimit=true, so that files won’t go to Trash because they are bigger than quota (0).