it looks pretty easy to fix. Use the edit button script menu to edit the POST CODE button.
near the bottom of the code are two subs, that start like this
Sub Finish_ClimbMill(Xpos, Ypos, length, Width, DEPTH, RadTool, finishamount, FeedPlunge, FeedRough, Feedfinish)
Code "X" & Xpos + length / 2 & " Y" & Ypos - finishamount * 2 - RadTool
Code "G0 Z" & (-1 * DEPTH) + Clearance
Code "G01 Z" & (-1 * DEPTH) & " F" & FeedPlunge
Add the variable Zjob to these lines, like
Code "G0 Z" & Zjob-(-1 * DEPTH) + Clearance
Code "G01 Z" & Zjob-(-1 * DEPTH) & " F" & FeedPlunge
Do the same for the Finish_ConvMill sub
I have not tested this, but it looks like it ought to work.