You would have to edit the lisp yourself, but this is a good opportunity for you to look at the lisp and discover how it works.
The lisp grabs coordinates, but to write them on the screen, they have to be changed from real numbers to a string of text that can be written to the screen.
The lisp function that does that is 'rtos' and it also has facilities to change the mode of the units and the precision.
So you look through the code until you find something in that vein.
Then you should find out what the modes are:-
1. Scientific 1.55E+01
2. Decimal 15.50
3. Engineering 1'-3.50"
4. Architectural 1'-3 1/2"
5. Fractional 15 1/2
and you can see that the lisp is set for Decimal mode 2. You probably want mode 3 or 4, so just edit those numbers, and save it.
As always there are different ways of doing things, but this should give you a start.
