Hi Markus,
It seems to me that you want a half-space between two characters, yes? Another way to get a half-space is to type a regular space, select it, and reduce the font size by ... oh, about 50%.
If this is something you're going to do a lot, you could record a new macro. First, decide if you want to save it in the current document or the Normal.dot template. Then, I'd assign it to the keyboard. (I used Alt-Z in my test.)
The actions I did were: change the font size to half of normal, type a space, change the font size back to normal, stop recording.
Condense/expand would probably also work in a macro.
- Rick -