Rotary axis in Qtdragon_hd

Hi, I am playing with qtdragon_hd and cannot seem to get a fourth rotary axis (XYZB) working in the preview in the way I would like. At the moment, in the simulation samples in the latest 2.9.3 release such as "qtdravon_hd_xyza", the rotary A-axis rotates the spindle. But in my setup, I want to rotate the stock. I've tried changing the "trivkins" in the INI file to other options, but then the machine doesn't even turn on for some reason! Does anyone have a working example they could share where the stock rotates rather than the spindle? Thanks! 

This is awesome! Thank you so much. Who would have thought it would be as easy as adding one character to my INI!

GEOMETRY = ​​​​​​! BXYZ

Thanks again! 

I know this will be a question that exposes my extreme ignorance, but I am trying to implement what is written in the INI documentation :

"G-code previews should be done with zero G5x, G92 offsets. This can be facilitated by setting offsets in programs only when task is running as indicated by #<_task> == 1" 

I understand the principle of this, but am not sure how to do it in practice! As I set the WCS offsets within the qtdragon_hd gui, how can I get those to only apply during running of the program? It seems like I would need to change the behavior of the GUI, but this is probably my misunderstanding. I'd appreciate greatly some step-by-step advice from someone who has gotten this working! Many thanks in advance! 

Where did you read that in the manual?

See point #11 under this link :

linuxcnc.org/docs/html/config/ini-config...#sub:ini:sec:display