Hi Katja,
The discussion you point to lays out the theoretical considerations quite well, particularly Greg Ver Steeg's well thought out comments. As they say, such normalisation really only makes sense if you are dealing with discrete variables rather than continuous ones. You then have a number of options to make the normalisation as they say.
In short, there is no option to do this in JIDT -- you would have to separately compute the quantity you want to normalise by, then divide your TE by that.