Hi /fox
Here is the old thread. The problem is described in the image of the first post.
Ah yes, I remember that one now.
As a matter of interest, I have a Desk Top Publishing program that is reasonably sophisticated and that does not do unequal borders either. There are pre-set graphical borders, some of which are asymmetrical but what they call "lines" (= QU border) around objects have to be equal.
To make asymmetrical borders you have to place & position a separate larger rectangle behind the object (eg. image). The same technique can be used in QU although probably not relevant to your card layout.
The point of comparing to a DTP program, which you may expect have more flexibility wrt borders, is to show QU is no worse and in some aspects is better.
So I created an excel sheet to help the calculations
I've done the same to calculate the dimensions of mounts (= mattes), it's a similar calculation.
Terry