Would be grateful of any feedback - Ie is this likely to be undertaken or not?

You can use "From expression" in target like this:

(a>b)?`x/y/z`:concat($(this:page), '/', $(this:row), '/', $(this:column))

Where when true - use another button stule
else
use this button style

@semenovnick that is a great idea, I didn't thin of suggesting that as a workaround.
You could probably simplify it and do

(a>b)?`x/y/z`:''

avoiding the extra noise of returning 'this button'. If it doesn't return a valid 'location', then it wont do anything

+1

My use case:
I have 8 computers that I need to send alternating keypresses (F1 and esc). I created 8 buttons with two feedback actions: "use another button style" and "change style based on button step" (step = 2). The release cycles 1 and 2, which alternates command and the style. In addition to configuring the press actions for each step, I must reconfigure the second feedback action for each of the 8 buttons

If I was able to use another button style with check button step I would create "style template" off-page. I could copy/paste my 8 buttons without additional feedback configuration, while also allowing me to edit "style template" buttons for future changes.